Question

A ball is dropped from a height of 100 m. It is embedded into sand 1 m and stops, then
(1) Momentum of the ball and the earth (system) remains conserved
(2) Only kinetic energy of the ball and the earth (system) remains conserved
(3) Both momentum and kinetic energy of the ball and the earth (system) are conserved
(4) Neither momentum nor kinetic energy of the ball and the earth (system) is conserved

Answer 1

Answer:

4.

Explanation:

Momentum is conserved when the mass of the earth(system) and ball remains constant during the landing of ball and when no net external force acts.

but in this case acceleration due to gravity , atmospheric forces are into action. thus momentum isnt conserved.

kinetic energy is conserved in an elastic collision where the masses that collide don't deform from the collision nor do they stick together.

and in this case, the ball sticks to the ground that is sirface of earth. hence Kinetic ensrgy is also not conserved.