Question

What happens to the kinetic energy when that mass of the body is doubled but the velocity is reduced to half

Answer 1

KE gets half.!!!!!!!!!!!!!!

Answer 2

Initially:

let mass=m1

Kinetic energy =KE1

velocity=v1

KE1=1/2*m1*v1^2

Given: m2=2m1

v2=1/2v1

So:-

KE2=1/2*m2*v2^2

=1/2*2m1*1/4v1^2

=1/4m1*v1^2

So KE2/KE1

=1/4m1v1^2/1/2m1v1^2

=1/2

So the kinetic energy becomes half of the initial kinetic energy.

Thanks.