Question

Question #2a2ef

Answer 1

`K=4kJ`

Explanation:

`F=ma =>a=F/m=>a=20/5=4m/s^2`

so the velocity is : `v=at=4*10=40m/s`

The kinetic energy is then :

`K=1/2mv^2=1/2*5*40*40=5*20*40=4000J=4kJ`