Question

A ball of mass 0.5 kg is dropped from rest at a point some distance above the ground. If the ball's kinetic energy just before it hits the ground is 25 J, from what height was the ball dropped?This process goes down on earth.

Answer 1

Height from which ball is dropped is 5.10 m

Step-by-step explanation:

We have given mass of the ball m = 0.5 kg

Acceleration due to gravity
`g=9.8m/sec^2`

Let the height from which ball is dropped is h m

Kinetic energy of ball is given Ke = 25 J

According to law of conservation of energy kinetic energy will be equal to potential energy

So
`ke=mgh`

`0.5* 9.8* h=25`

h = 5.10 m

So height from which ball is dropped is 5.10 m