Question

a body falls a height of 10meters and rises from the hard floor . in the impact ,it's energy is reduced by 20% .now what height will it jump?

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Answer 1

Answer:

8 m

Step-by-step explanation:

Given that the body 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 20% of its initial energy:

i.e. (20/100)× 100m J

=20m J

The energy left on striking the ground = 100 m J - 20 m J

= 80 m J

So the final energy of the ball , mgh2 = 80m J

i.e h2 = (80 /10)

= 8 m

Hence the body will bounce back to a height of 8 m after the impact.

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Hope it helped (◕ᴗ◕✿)