Question

A body of mass 5 kg initially at rest is subjected to a force of 20N.What is the kinetic energy acquired by the body at the end of 10 S?

Answer 1

Explanation:

F=ma

20=5a

a=4m/s2

v=u+at

initially at rest so u=0

v=at

v=4*10

v=40m/s

KE=1/2mv2

=(1/2)*5*40*40

=4000

KE=4000J