Question

A ball is dropped from a height of hundred metre if 20 percentage of energy is lost due to hit on the ground then the height to which it can rebound is

Answer 1

Step-by-step explanation:

Given that the ball is dropped from a height, h1 = 10 m

Potential energy at h1 = mgh1

Given g =10 m/s2 , h1 = 10 m

Therefore the potential energy at h1 = m×10×10

= 100m J

On striking the ground level, the ball looses 40% of its initial energy:

i.e. (40/100)× 100m J

=40m J

The energy left on striking the ground = 100 m J - 40 m J

= 60 m J

So the final energy of the ball , mgh2 = 60m J

i.e h2 = (60 /10)

= 6 m

Hence the ball will bounce back to a height of 6 m