Question

A ball of mass 200 g falls from a height of 5 mtr.What is the kinetic energy when it just reaches the ground(g=9.8metres per second square)

Answer 1

height=5m.
mass=200g (0.2 kg)
g=9.8m/s^2
∴ potential energy=mgh
                         = 0.2*5*9.8
                         = 9.8 J
∵ P.E at the highest point= K.E at the lowest point (when it is just about to hit the ground)
∴ K.E energy will be= 9.8 J 
                           i hope that this will help u..........................

Answer 2

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height=5m.

mass=200g (0.2 kg)

g=9.8m/s^2

∴ potential energy=mgh

                         = 0.2*5*9.8

                         = 9.8 J

∵ P.E at the highest point= K.E at the lowest point (when it is just about to hit the ground)

∴ K.E energy will be= 9.8 J 

     i hope that this will help you......

jai hind.....

bharat mata ki jai ......

proud to be an indian......................