A ball of mass 0.5 kg slows down from a speed of 5 m/s to that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
Mass, m = 0.5 kg
Initial velocity (v1) = 5m/s
Final velocity (v2) = 3m/s
Initial K.E = 1/2m (v1)2
=1/2 × 0.5 × (5)2
Final K.E = 1/2 (mv2)2
=1/2 × 0.5 × (3)2
Work done = Change in K.E
= 2.25 - 6.25
= - 4 J