Answers

2014-08-14T20:05:09+05:30
Loss in potential energy = gain in kinetic energy 
m = 0.2 Kg.
g = 10 m/sec²
h = 2 m
loss in potential energy = mgh = 0.2*10*2 = 4 joule
hence kinetic energy of the ball when it reaches the ground = 4 joule 
0