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Q.

A ball is gently dropped from a height of $20 m$ . If its velocity increases uniformly at the rate of $10 m / s²$ , with what velocity will it strike the ground?

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a

20 m / s

b

30 m / s

c

40 m / s

d

50 m / s

answer is A.

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Detailed Solution

The ball will strike the ground with the velocity of

20 m / s

.
Given:

u = 0,

S = 20 m,

a = 10 m / s²

.
Formula:

v² - u² = 2 aS

Putting all the values we get,

v² - 0 = 2 \times 10 \times 20

or,

v = 20 m / s .

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A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m/s², with what velocity will it strike the ground?