A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find: (i) … of the ball on collision. (Take: g…
Given: m = 50g = 50/1000 kg = 0.05kg, g = 10N kg-1, h1 = 2m = 1.6 m.
(i) Initial potential energy possessed by the ball = mgh1 = 0.05 x 10 x 2 = 1.0 J.
(ii) The K.E. of the ball before it hits the ground
= Initial potential energy possessed by the ball
= 0.1 J
(iii) The Final potential energy of the ball = mgh2
= 0.05 x 10 x 1.6 = 0.8J.
(iv) The Kinetic energy of the ball after striking the ground
= Final potential energy of the ball = 0.8 J