Question

A body falling freely from a height of 10 m hits a floor. If it loses 20% of its energy during impact, it
again rises to a height of
(A) 8 m
(B) 6 m
(C) 4 m
(D) 2 m​

Answer 1

Answer:

Option(A) - 8 m

Explanation:

Given,

height = 10 m, g = 10 m/s,

Potential energy = mgh

= m * 10 * 10

= 100 m.

It loses 20% of its energy during impact.

= 20% of 100

= 20 m

Then,

Energy left on striking the ground = 100 m - 20 m

= 80 m J

It means, final energy = 80 m J.

Thus,

h = (80/10) = 8 m

Therefore,

It raises to a height of 8 m.

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