Problems 4-6 must use work/energy/power principles to solve (3 pts) A worker uses 85 W of power for 15 minutes to raise 20 kg blocks up a vertical distance of 1.5 m. How many blocks were raised?
(5 pts) A 1.5 kg jet starts from rest on the runway. Its engines exert a constant force of 6.0 N of thrust along a 65 km long path. At the end of the path, the jet is moving at 240 m/s at an altitude of 9.5 km. Determine the frictional force acting on the jet.
(5 pts) A 0.25 kg ball is thrown downward at 6.0 m/s from the top of a 25 m tall building. Determine the speed of the ball when it reaches a position 10 m above the ground!