Answers

  • qais
  • Content Quality
2016-01-14T12:38:33+05:30
See initially body has potential energy = m×g×h
                                                             = 100mg joule 
kinetic energy = 0
total energy = 100 mg joule
now after striking with the floor, energy lost = 30% of 100mg 
                                                                      = 30mg joule
energy left = 70 mg

Let after impact it reaches a maximum height = H
At height H
KE = 0 (as velocity is 0 at maximum height)
now, potential energy = m×g×h = 70 mg
height = 70 m
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