**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…**

###### Answers:

**Given: **m = 50g = 50/1000 kg = 0.05kg, g = 10N kg^{-1}, h_{1 }= 2m = 1.6 m.

**(i)** Initial potential energy possessed by the ball = mgh_{1 }= 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 = mgh_{2}

= 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