Question

The momentum of a body is doubled. What is the percentage change in its kinetic energy

Answer 1

Here, mass is constant so the only changing quantity is velocity so if velocity get doubled ie. p=m(2v) then the KE. get increased by 4times as KE.=1/2 m(2v)2 or 1/2 m4v2). So the per cent increase in KE. is by 300%