Question

a body of mass 5 kg initially at rest undergoes an acceleration of 4 m/s 2 , when subjected to a certain force .what is the kinetic energy attained by the body at the end of 10 second

Answer 1

Let velocity after 10s be v
                           t=10 s  , m =5kg  a =4m/s²
               We have v = at = 4*10=40m/s
                KE= mv²/2= 5*40²/2=4000 joules