Aball with a mass of 0.5 kilograms is lifted to a height of 2.0 meters and dropped. it bounces back to a height of 1.8 meters.
the energy of the ball has been reduced by (0.98, 8.82, 9.8) joules after bouncing back. this reduction happens because potential energy transforms to (kinetic, light, thermal energy).

hint: use pe = m × g × h where g = 9.8 m/s2.

Change in potential energy,

Explanation:

It is given that,

Mass of the ball, m = 0.5 kg

It is lifted to a height of, Initial height, h = 2 m

It bounces back to a height of 1.8 meters, final height, h' = 1.8 m

It can be assumed to find the change in potential energy in the entire process. Let is the initial potential energy. It is given by :

Let is the final potential energy. It is given by :

Let is the change in potential energy. It is equal to :

So, the change in gravitational potential energy is 0.98 J. Hence, this is the required solution.