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An elastic balls falls from a height of...

An elastic balls falls from a height of 10 m . If lose 80 % of its total energy due to impact . The ball will now rise to a height of ?

A

80 m

B

40 m

C

60 m

D

20 m

Text Solution

Verified by Experts

The correct Answer is:
D
Here ball loses 80 % energy so when it hit the ground , its potential energy will be 20 % to initial potential . If new height is h. then ,
mgh = 20 % mgh
` h = 0.2 h = 0.2 xx100`
` :. h = 20 m `
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