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Shown in the figure are the position time graph for two children going home from the school. Which of the following statements about their relative motion is true after both of them started moving? Their relative velocity (consider $1 - D$ motion)

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Important Questions on Kinematics

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 33

Shown in the figure are the velocity time graphs of the two particles $P_{1}$ and $P_{2}$ . Which of the following statements about their relative motion is true? Their relative velocity (consider $1 - D$ motion)

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 34

Two particles are moving with velocities

v_{1}

and

v_{2}

. Their relative velocity is maximum when the angle between their velocities is

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 35

To cross the river in shortest distance, a swimmer should swim making angle

θ

with the upstream. What is the ratio of the time taken to swim across in the shortest time to that in swimming across over shortest distance [assume speed of swimmer in still water is greater than the speed of river flow].

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 37

Raindrops are falling vertically with a velocity of

10 {ms}^{- 1}

. To a cyclist moving on a straight road the raindrops appear to be coming with a velocity of

20 {ms}^{- 1}

. The velocity of cyclist is

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 38

Two identical trains take 3 sec to pass one another when going in the opposite direction but only 2.5 sec if the speed of one is increased by 50% The time one would take to pass the other when going in the same direction at their original speed is:

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 39

For four particles

A, B, C

and

D

the velocities of one with respect to the other are given as

{\vec{V}}_{D C}

20 m s^{- 1}

towards the north,

{\vec{V}}_{B C}

20 m s^{- 1}

towards the east and

{\vec{V}}_{B A}

20 m s^{- 1}

towards the south. Then

{\vec{V}}_{D A}

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 40

A Person

A

observes

B

moving in east direction, with a speed

10 m s^{- 1}, B

observes

C

moving in south direction, with a speed

20 m s^{- 1}, C

observes

D

moving in west direction, with a speed

30 m s^{- 1}

and

D

observes a tree, moving with speed

40 m s^{- 1}

, in the north direction. The actual direction of motion of person

A

will be

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Alpha Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise-2>Q 41

Three elephants $A, B and C$ are moving along a straight line with constant speed in same direction as shown in figure. Speed of and speed of $C$ is $10 {ms}^{- 1}$ . Initially separation between $A & B$ is $d$ and between $B & C is also d$ . When $B$ catches $C$ separation between $A & C becomes 3 d$ . Then the speed of $B$ will be

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Shown in the figure are the position time graph for two children going home from the school. Which of the following statements about their relative motion is true after both of them started moving? Their relative velocity (consider 1-D motion)

Important Questions on Kinematics

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Shown in the figure are the position time graph for two children going home from the school. Which of the following statements about their relative motion is true after both of them started moving? Their relative velocity (consider $1 - D$ motion)