Question

A body falling from height of 10 cm rebounds from hard floor if it loses20%energy in the impact then co efficient of restitution is

Answer 1

hello.... ☺


h = 10m

mgh = 10mg

KE = 0

Total Energy (TE) = 10mg



PE = 0

KE = TE ➖ PE = 10mg


energy lost = 20% of 10mg
= 2mg

Total Energy Left (TE)
= 10mg ➖ 2mg = 8mg

max height = H

KE = 0

PE = mgH

PE = TE = 8mg

so
mgH = 8 mg

or H=8m



thank you ☺