7. Friction, Inclines, Systems

(II) A package of mass m is dropped vertically onto a horizontal conveyor belt whose speed is v = 1.5m/s, and the coefficient of kinetic friction between the package and the belt is μ_k = 0.70. How far does the package move during this time?

A 68-kg water skier is being accelerated by a ski boat on a flat ('glassy') lake. The coefficient of kinetic friction between the skier's skis and the water surface is μₖ = 0.25 (Fig. 5–59). Explain why the skier's acceleration in part (b) is greater than that in part (a).