Question

A ball of mass 0.5kg slows down from a speed of 5 metre per second to that of 3 metre per second. Calculate the change in kinetic energy of the ball.​

Answer 1

M=0.5kg v(initial)=5m/s V(final)=3m/s

change in K.E=1/2×M×V×V-1/2×M×v×v

=1/2×0.5×9-1/2×0.5×25

=2.25-6.25

=-4kgm/ss