Question

An elastic ball is dropped from a height 19.6m , above a smooth horizontal floor. If e=1/2 the time taken to the ball completely comes to rest is






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Answer 1

Explanation:

ball is dropped from a height of 19.6m. The distance covered by it in the last second is

Medium

Solution

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Correct option is

B

14.7m

Let x be the distance covered in the last second. Now using v=u+gt, we get

2gh

=

2g(h−x)

+g

2g(19.6)

=

2g(19.6−x)

+g

Solving the above equation we get,

x=14.7m

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