10. In an elastic collision, an object with momentum 25 kg. m/s collides with another object moving to the right that has a
momentum 35 kg . m/s. After the collision, both objects are still moving to the right, but the first object's momentum
changes to 10 kg. m/s. What is the final momentum of the second object?
a. 10kg. m/s
b. 20 kg · m/s
c. 35 kg · m/s
d. 50 kg · m/s

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?