Answer: Looked it up but
Explanation:
When the skater lands on the track, the vertical component of his kinetic energy is converted to thermal energy. You can do experiments where there is no loss to thermal energy (only PE and KE conversions) by turning friction off and by making sure the skater doesn't leave the track.
L = r x p = rmv = mr²ω
L = 0.25 x 0.75² x 12.5 = 1.758
Newton´s thrid law of motion states that:
Every action has an equal and opposite reaction.
c. equal, opposite.
