Class 9th MOTION

An object undergoes an acceleration of 8 ms^-2 starting from rest. Distance traveled in 1 s is :

• 2

• 4

• 6

• 8

• 1/2

• 1/4

• 1/3

• 2/3

A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of 30m/s.

The average velocity of the body during the whole journey is

• 0

• 25m/s

• 24m/s

• NOTA

If an object covering distances in direst proportion to the square of time lapsed, then the acceleration is

• INCREASING

• DECREASING

• CONSTANT

• NOTA

Distance travelled by a freely falling body is proportional to :-

• mass of the body

• square of the acceleration due to gravity

• square of the time of fall

• time of fall

The rate of change of displacement with time is :-

• speed

• acceleration

• retardation

• velocity

Which of the following is not vector quantity ?

• Retardation

• Acceleration due to gravity

• Average speed

• Displacement

If the time-displacement graph of a particle is parallel to the time-axis then velocity of the particle is :-

• infinity

• unity

• equal to acceleration of the body

• zero

In the velocity-time graph, AB shows that the body has

• uniform acceleration

• non uniform retardation

• uniform speed

• initial velocity OA and is moving with uniform retardation

• A

• B

• C

• D