Question

A ball of mass 200g falls from hieght of 5 meters.What is its kinetic energy when it just reaches the ground (g=9.8)

Answer 1

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)

∴ K.E energy will be= 9.8 J 

                          i hope that this will help u..........................

Answer 2

Hi

Here is your answer

Height = 5 m

Mass = 200g = 0.2 kg

g = 9.8 m/s²

Potential energy = mgh

                            = 0.2 × 9.8 × 5

                            = 1.96 × 5

                P.E           = 9.8 J

When it reaches the ground,

The Potential energy at highest point = Kinetic energy of lowest point

Therefore,

Kinetic Energy = 9.8 J

Hope it helps You....