Question

.A stone of mass 2 kg is falling from rest from the top of a steep hill. What will be its kinetic energy after 5 sec? (g = 10 ms-2)

Answer 1

a=10

v=u+at

v=0+5*10

v=50m/s

kinetic energy =1/2mvsquare

=1/2 * 50 *50 *2

=2500joules