Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 35

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A body is gently dropped from the top of tower. Sensors are fixed in the wall of the tower at different distances. The distance recorded by the sensors in $2 nd, 3 rd and 4 th$ second would be in the ratio of :

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Important Questions on Motion

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 36

A photographer arranges to expose photographs of a ball describing motion under free fall, such that it is photographed on a vertical scaling starting from zero. He photographed the ball when it was at

76.05 m

and then when it was at

80 m

. The time of exposure set on the camera is : (Take

g = 9.8 m / s^{2}

)

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 37

The water level in a well is at a depth of

125 m

. If the acceleration due to gravity is

10 {ms}^{- 2}

and a boy gently drops the stone, he hears the sound of splash in

5.35 s

. The speed of sound is :

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 38

A freely falling stone covers half of its free fall from the top of a building in

0.5 s

. The height of the building is:

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 39

A bullet fired on a wooden plank with a velocity of

10 m / s

just penetrates through it. If the bullet penetrates

10

such wooden planks, its velocity is :

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 40

A raindrop starts from a cloud at a height of

100 m

and is acted upon by a constant acceleration of

8 {ms}^{- 2}

on account of friction of air. The raindrop will reach the ground in:

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 41

A rain drop starts from a cloud at a height of

100 m

and is acted upon a constant acceleration of

8 m / s^{2}

on account of friction of air. The velocity of raindrop on reaching ground is :

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Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 42

A car running at a speed

72 {kmh}^{- 1}

is slowed down to

18 {kmh}^{- 1}

over a distance of

40 m

. The retardation produced by its brakes is :

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IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 43

A car running at a speed $72 {kmh}^{- 1}$ is slowed down to $18 {kmh}^{- 1}$ over a distance of $40 m$ .

The time for which brakes are applied is :