Question

A ball of mass 200g falls from a height of 5 meters.What is the kinetic energy when it just reaches the ground?(assume g=10m/s2)

Answer 1

kinitic energy of ball is 10 joule

Answer 2

Answer:

10J

Explanation:

m = 200g = 0.2 kg

h = 5m

:. Potential Energy of ball = mgh = 0.2 * 10 * 5 = 10J

By conservation of energy, Energy is always constant at every point of an object.

At 5 m, potential energy was maximum and at 0 m, Potential Energy is 0 and Kinetic Energy is the maximum.

:. Potential Energy at 5m = Kinetic Energy at 0m......(Conservation of Energy)

:. Kinetic Energy at 0m is 10J.