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Q.

A ball is dropped onto a fixed horizontal surface from a height10 m . The coefficient of restitution is0.5 . The average speed of the ball before the ball comes to rest  is

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a

6ms–1

b

3.88 m/s

c

6.23 ms–1

d

10 ms–1

answer is B.

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Detailed Solution

Vavg=1+e2(1+e)2gh2   =1+0.252.25]9.8×102=0.55556x7  = 3.88892 = 3.88
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