A hockey puck (mass = 2.5 kg) leaves the players stick with a speed of 40 m/s and slides on the ice for 40 meters before coming to rest. What is the friction coefficient between the puck and the ice?
(unitless)

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?