Suppose a box is being dragged by a force of 100 n over a rough surface. if the coefficient of kinetic friction at the interface of the box and surface is 0.2, and the box is moving with a constant speed of 2 m/s, calculate the net work done on the box if it is dragged for 1.0 m.

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?