Question

A ball of mass 75g is thrown upward with an initial positive velocity, vi, at position A.  

Match the energy transformations taking place for each region of the ball's motion.

Question 23 options:

Moving from Position C (before hitting the ground) to stopped after hitting the ground Position B to Position C    Position A to Position B

1. K → Ug 2. Ug → K 3. K → Eth 4. Ug → Eth

Answer 1

At point C (before hitting) energy is in form of kinetic energy and this kinetic energy is getting converted to thermal energy when ball stops after hitting ground

Hence for first sentence

Moving from Position C (before hitting the ground) to stopped after hitting the ground , 3rd option is correct      K → Eth

For position B to position C, height is decreasing and speed is increasing so energy is being transferred from potential energy to kinetic energy. Hence

Position B to Position C        =            Ug → K

For position A to position B, height is increasing and speed is decreasing so energy is being transferred from kinetic energy to potential energy. Hence

Position A to Position B        =            K → Ug