Question

A ball of mass 2kg falls from rest from a height of 200m. Calculate its kinetic energy after falling a distance of 150m.

Answer 1

Kinetic energy after falling a distance is equal to change of potential energy:

$$E k = \Delta E p$$ $$\Delta E p = m \times g \times \Delta h$$

Where: $g$ is the acceleration due to gravity, $\Delta h$ height differents (distance)

On a condition: $m = 2Kg, \Delta h = 150m$

$$E k = \Delta E p = 2 * 9.8 * 150 = 2940 \, J.$$

Answer: Kinetic energy after falling a distance 150 m will be 2940 J.