Question

5. An inelastic ball is dropped from a height 100 m.
due to impact it loses 35% of its energy the ball will
rise to a height of:
(A) 35 m
(B) 65 m
(C) 100 m
(D) 135 m

Answer 1

Answer:

(B)65m

Explanation:

Total Energy of the ball = mgh where h is max height

                                       =100mg

As it loses 35% of energy due to impact ,

New Total Energy = (1 -35/100)x100mg

                              =65/100x100mg

                              =65mg

For height to be max , Total Energy=Potential Energy

65mg=mgh

h = 65m