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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/, 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,
= 10 m/.
Formula: -u² = 2aS
Putting all the values we get,
-0 =2×10×20
or, = 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?