Question

mass of a body is increased by 2 times and velocity is decreased by 3 time. find the ratio of its initial and new kinetic energy​

Answer 1

Answer:

let initial velocity be 'v'

and initial mass of the body be 'm'

Then Initial kinetic energy =mv²/2

final kinetic energy when mass is 2m, velocity is v/3

=2m(v/3)²/2

=mv²/9

therefore (initial KE)/(final KE)= mv²/2/mv²/9

= 9/2