1.A 1,000-W motor powers a hoist used to lift cars at a service station.

a.How much time would it take to raise a1,700-kg car3m?

b.If the original motor is replaced with one rated at3,000W, how long would it take to complete this task?

2.A running back with a mass of76kgand a velocity of6m/s(toward the right) collides with, and is held by, a114-kgdefensive tackle going in the opposite direction (toward the left). What is the velocity of the tackle before the collision for their velocity afterward to be zero? (Remember, velocity is a vector)