A ball of mass 200g falls from a height of 5 metre what is its work done when it just reaches the ground ? ( g = 9.8 m/s² )
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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)
∴ Kinetic energy will be= 9.8 J
as we know Kinetic energy=work done
so work done will be= 9.8 J
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