Question

A ball of mass $200g$ falls from a height of $5$ metres .What is its kinetic energy when it just reaches the ground?

Answer 1

Given,

mass of ball is $=m=200g=0.2kg$

The height from which the ball drops is $=h=5m$

Using the conservation of mechanical energy

loss of potential energy = gain in kinetic energy

$mgh=K.E$

$K.E=0.2\times 9.81\times 5$

$K.E=9.81J$