Before the force is applied (t <0 on the graph), the particle moves along the x axis with velocity of v1=-4.1 m/s. Find the velocity v2 of the particle after the force
stops acting on it (t>7 s). Answer in units of m/s.

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?