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A ball is gently dropped from a height of 20 m. If its velocit

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Class 9

NCERT

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Fig shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:

(a)

Which of the three is travelling the fastest?

(b)

Are all three ever at the same point on the road?

(c)

How far has C travelled when B passes A?

(d)

How far has B travelled by the time it passes C?

A ball is gently dropped from a height of

20 m

. If its velocity increases uniformly at the rate of

10 m s^{- 2}

, with what velocity will it strike the ground? After what time will it strike the ground?

The speed-time graph for a car is shown in Fig.

(a)

Find how far does the car travel in the first

4

seconds. Shade the area on the graph that represents the distance travelled by the car during the period.

(b)

Which part of the graph represents uniform motion of the car?

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Question

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Solving time: 3 mins

A ball is gently dropped from a height of $20 m$ . If its velocity increases uniformly at the rate of $10 m s^{- 2}$ , with what velocity will it strike the ground? After what time will it strike the ground?

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Updated on: Jul 8, 2023

Book:

Science (NCERT)

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William Discussed

A ball is gently dropped from a height of

20 m

. If its velocity increases uniformly at the rate of

10 m s^{- 2}

, with what velocity will it strike the ground? After what time will it strike the ground?

12 mins ago

Discuss this question LIVE

12 mins ago

Text solutionVerified

Height,

s = 20 m

Acceleartion ,

a = 10 m / s^{2}

By 3rd equation of motion

v^{2} = u^{2} + 2 a s

v^{2} = 0 + 2 \times 10 \times 20 = 400

\Rightarrow v = 20 m / s

So, we conclude final velocity ,

v = 20 m / s

again, by 1st equation of motion ,

v = u + a t

\Rightarrow t = \frac{v - u}{a}

\Rightarrow t = \frac{20}{10} = 2 s

So, it will strike the ground after

2 s

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Practice more questions from Science (NCERT)

Fig shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:

(a)

Which of the three is travelling the fastest?

(b)

Are all three ever at the same point on the road?

(c)

How far has C travelled when B passes A?

(d)

How far has B travelled by the time it passes C?

A ball is gently dropped from a height of

20 m

. If its velocity increases uniformly at the rate of

10 m s^{- 2}

, with what velocity will it strike the ground? After what time will it strike the ground?

The speed-time graph for a car is shown in Fig.

(a)

Find how far does the car travel in the first

4

seconds. Shade the area on the graph that represents the distance travelled by the car during the period.

(b)

Which part of the graph represents uniform motion of the car?

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Question Text	A ball is gently dropped from a height of $20 m$ . If its velocity increases uniformly at the rate of $10 m s^{- 2}$ , with what velocity will it strike the ground? After what time will it strike the ground?
Updated On	Jul 8, 2023
Topic	Motion
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 32
Upvotes	3597
Avg. Video Duration	5 min

A ball is gently dropped from a height of $20 m$ . If its velocity increases uniformly at the rate of $10 m s^{- 2}$ , with what velocity will it strike the ground? After what time will it strike the ground?

Text solutionVerified

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