A ball is dropped from a height 10m. The ball is embeded in sand through 1m and stop,then
Correct answer: D. Neither kinetic energy nor momentum is conserved
- 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
Explanation
In this scenario, neither kinetic energy nor momentum is conserved. The law of conservation of momentum applies only to isolated systems without external forces. Here, gravity and the friction of the sand are external forces acting on the ball. As the ball embeds in the sand, energy is lost through heat and deformation, meaning kinetic energy is also not conserved. Thus, the correct answer is that neither kinetic energy nor momentum is conserved.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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