Question

A body of mass m is moving with a velocity 5 ms-1 its kinetic energy is 25 j. if its velocity is doubled, what is it kinetic energy

Answer 1

mass=5kg
velocity=10m/s
k.e=1/2mv^2
1/2*5*10*10=250
or
after doubled
mass=10kg
velocity=30m/s
k.e 1/2mv^2
1/2*10*30*30
=450*10=4500
Ratio=250/4500=1/18