Instruction: The table given below shows distance (in cm ) travelled by the bodies A, B and C. Read this data carefully and answer the question which follow. Distance (in cm ) covered by different bodies Time Body A Body B Body C 1 st second 20 20 20 2 nd second 20 36 60 3 rd second 20 24 100 4 th second 20 30 140 5 th second 20 48 180 Which of the bodies covers minimum distance in 3 rd second?

From the given table, among the three bodies, the body A is covering the minimum distance in 3 rd second. It is covering 20 cm whereas, the body B and body C are covering 24 cm and 100 cm respectively. So, speed of A is minimum as compared to other two bodies at that point of time.

Instruction: The table given below shows distance (in cm ) travelled by the bodies A, B and C. Read this data carefully and answer the question which follow. Distance (in cm ) covered by different bodies Time Body A Body B Body C 1 st second 20 20 20 2 nd second 20 36 60 3 rd second 20 24 100 4 th second 20 30 140 5 th second 20 48 180 Which of the bodies is moving with non-uniform acceleration?

From the given table, among the three bodies, the body B is moving with non-uniform acceleration. The distances covered by it during the entire motion are different for each second and changing unequally in each interval of time.

An object is moving along a straight line with uniform acceleration. The following table gives the velocity of the object at various instants of time. Time (in s ) 0 1 2 3 4 5 6 Velocity (in m / s ) 2 4 6 8 10 12 14 Plot the graph. From the graph, find the velocity of the object at the end of 2 . 5 seconds.

The velocity-time graph of the object moving along a straight line with uniform acceleration is shown as under: From the graph, the velocity of the object at the end of 2 . 5 seconds is 7 m s - 1 .

An object is moving along a straight line with uniform acceleration. The following table gives the velocity of the object at various instants of time. Time (in s ) 0 1 2 3 4 5 6 Velocity (in m s - 1 ) 2 4 6 8 10 12 14 Plot the graph. From the graph, calculate the distance covered in the last 4 seconds.

The velocity-time graph of the object moving along a straight line with uniform acceleration is shown as under: Here, the distance covered in the last 4 s can be calculated by the area under the graph of last 4 s , that is from the 2 nd second to the 6 th second. For calculating the distance, the values of the velocities corresponding to t 1 = 2 s is v 1 = 6 m s - 1 and that corresponding to t 2 = 6 s is v 2 = 14 m s - 1 . Thus, the distance covered is s = v 1 + v 2 2 × t 2 - t 1 = 6 + 14 2 × 6 - 2 = 20 2 × 4 = 40 m .

R P Manchanda, Dr. Neha Jindal and, Ms. Archita Baruah Bhattacharyya Solutions for Chapter: Motion, Exercise 1: ASSESS YOURSELF

Author:R P Manchanda, Dr. Neha Jindal & Ms. Archita Baruah Bhattacharyya

R P Manchanda Science Solutions for Exercise - R P Manchanda, Dr. Neha Jindal and, Ms. Archita Baruah Bhattacharyya Solutions for Chapter: Motion, Exercise 1: ASSESS YOURSELF

Attempt the free practice questions on Chapter 8: Motion, Exercise 1: ASSESS YOURSELF with hints and solutions to strengthen your understanding. Together with Science Class 9 solutions are prepared by Experienced Embibe Experts.

Questions from R P Manchanda, Dr. Neha Jindal and, Ms. Archita Baruah Bhattacharyya Solutions for Chapter: Motion, Exercise 1: ASSESS YOURSELF with Hints & Solutions

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 38

Instruction: The table given below shows distance (in $cm$ ) travelled by the bodies A, B and C.

Read this data carefully and answer the question which follow.

Distance (in $cm$ ) covered by different bodies

Time	Body A	Body B	Body C
$1^{st}$ second	$20$	$20$	$20$
$2^{nd}$ second	$20$	$36$	$60$
$3^{rd}$ second	$20$	$24$	$100$
$4^{th}$ second	$20$	$30$	$140$
$5^{th}$ second	$20$	$48$	$180$

Which of the bodies covers minimum distance in $3^{rd}$ second?

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 38

Instruction: The table given below shows distance (in $cm$ ) travelled by the bodies A, B and C.

Read this data carefully and answer the question which follow.

Distance (in $cm$ ) covered by different bodies

Time	Body A	Body B	Body C
$1^{st}$ second	$20$	$20$	$20$
$2^{nd}$ second	$20$	$36$	$60$
$3^{rd}$ second	$20$	$24$	$100$
$4^{th}$ second	$20$	$30$	$140$
$5^{th}$ second	$20$	$48$	$180$

Which of the bodies is moving with non-uniform acceleration?

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 39

An object is moving along a straight line with uniform acceleration. The following table gives the velocity of the object at various instants of time.

Time (in $s$ )	$0$	$1$	$2$	$3$	$4$	$5$	$6$
Velocity (in $m / s$ )	$2$	$4$	$6$	$8$	$10$	$12$	$14$

Plot the graph.

From the graph, find the velocity of the object at the end of $2.5$ seconds.

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 39

An object is moving along a straight line with uniform acceleration. The following table gives the velocity of the object at various instants of time.

Time (in $s$ )	$0$	$1$	$2$	$3$	$4$	$5$	$6$
Velocity (in $m s^{- 1}$ )	$2$	$4$	$6$	$8$	$10$	$12$	$14$

Plot the graph.

From the graph, calculate the acceleration.

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 39

An object is moving along a straight line with uniform acceleration. The following table gives the velocity of the object at various instants of time.

Time (in $s$ )	$0$	$1$	$2$	$3$	$4$	$5$	$6$
Velocity (in $m s^{- 1}$ )	$2$	$4$	$6$	$8$	$10$	$12$	$14$

Plot the graph.

From the graph, calculate the distance covered in the last $4$ seconds.

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 40

A person moves a distance of $3 km$ towards east, then $2 km$ towards north and $3.5 km$ towards east. Find distance covered by the person.

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 40

A person moves a distance of $3 km$ towards east, then $2 km$ towards north and $3.5 km$ towards east. Find displacement of the person.

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 41

On a $120 km$ track a train travels the first $30 km$ at a uniform speed of $30 km / h$ . Calculate the speed with which the train should move rest of the track so as to average $60 km / h$ for the entire trip.

R P Manchanda, Dr. Neha Jindal and, Ms. Archita Baruah Bhattacharyya Solutions for Chapter: Motion, Exercise 1: ASSESS YOURSELF

R P Manchanda Science Solutions for Exercise - R P Manchanda, Dr. Neha Jindal and, Ms. Archita Baruah Bhattacharyya Solutions for Chapter: Motion, Exercise 1: ASSESS YOURSELF

Questions from R P Manchanda, Dr. Neha Jindal and, Ms. Archita Baruah Bhattacharyya Solutions for Chapter: Motion, Exercise 1: ASSESS YOURSELF with Hints & Solutions

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