Question

A body of mass m falls from height h on ground. If 'e' be the coefficient of restitution of collision between the body and ground, then the distance travelled by body before it comes to rest is

Joshi sir comment

if a body falls from height h then height attained after rebound will be e2h

by using this fact

total distance covered before stop = h+2e2h+2e2e2h+2e2e2e2h+..................................................

so d = h+2e2h[1+e2+e4+e6+.........................]

now solve 

 

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