A motor must lift a 70 pound object to a height of 14 feet about the floor. What is the minimum amount of work the motor must do?

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

Which type of basaltic lava flow has a fairly smooth

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?