Question

A ball is dropped from height 10 metre. It gets embedded in sand by 15 mm and then stops. which of the following is conserved ?

1 momentum

2 kinetic energy

3 temperature

4 both (A) and (B)

​

Answer 1

If a ball is dropped from a height and then it is embedded in sand and stops then (d) Neither kinetic energy nor momentum is conserved. External forces are the ball weight and the resistance due to sand. Therefore, momentum is not conserved when there is zero external force.

Answer 2

Answer:

1 momentum is the right answer