Question

A ball is dropped from a height of 10 m. Ball is embedded in sand through 1 m and stops.

• A. Only momentum remains conserved.
• B. Only kinetic energy remains conserved.
• C. Both momentum and kinetic energy are conserved.
• D. Neither kinetic energy nor momentum is conserved.

Answer 1

The correct option is D Neither kinetic energy nor momentum is conserved.

For the Ball: weight of the ball and resistance due to sand are external forces.

Hence, momentum is not conserved unless external force is zero.