Question

if energy of a ball falling from a hight of 10m is reduced by 40% how high will it rebound

Answer 1

Let E be the energy of the ball falling through a height of 10m

E = mgh (potential energy)
E = m(9.8)(10)
E = 98m J ; (where m = mass of body.)

now let’s suppose the body losses 40% of its energy and rebounds back to a height of “h1’ and its new energy is “E1” which is 60% of the initial energy “E”

E1 = 60% (E)
Hope it helps!!!!