EASY
9th CBSE
IMPORTANT
Earn 100

An aircraft travelling at 600 km h-1 accelerates steadily at 10 km h-1 per second. Taking the speed of sound as 1100 km h-1 at aircraft's altitude, how long will it take to reach the 'sound barrier'?

Important Questions on Motion

EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Short Answer Type Questions>Q 33
If a bus travelling at 20 m s-1 is subjected to a steady deceleration of 5 m s-2, how long will it take to come to rest?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Long Answer Type Questions>Q 34
What is the difference between 'distance travelled' by a body and its 'displacement'? Explain with the help of a diagram.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Long Answer Type Questions>Q 34
An ant travels a distance of 8 cm from P to Q and then moves a distance of 6 cm at right angles to PQ. Find its resultant displacement.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Long Answer Type Questions>Q 35
Define motion. What do you understand by the terms 'uniform motion' and 'non-uniform motion'? Explain with examples.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Long Answer Type Questions>Q 36
Define speed. What is the SI unit of speed?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Long Answer Type Questions>Q 36
What is meant by (i) average speed and (ii) uniform speed?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Long Answer Type Questions>Q 37
Define velocity. What is the SI unit of velocity?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 1 - Motion>Long Answer Type Questions>Q 37
What is the difference between speed and velocity?