Question

Which has greater kinetic energy a 2 kg mass moving at 3 m/s,or,a 1 kg mass moving at 6 m/s?

Answer 1

Kinetic energy is given by

`E_k=1/2mv^2` where `m` is mass object, and `v` velocity

In our case:

`E_(k1)=1/2·2·9=9`

`E_(k2)=1/2·1·36=18` and we see

`E_(k2)=2·E_(k1)` and therefore `E_(k2)>E_(k1)`