1. A worker pulls a crate 10.0 m by exerting a force of 300 N.
(a) How much work does the worker do?
(b) How much work does the worker do pulling the crate a distance of 10.0 m by exerting the same force at an angle of 20.0° with the horizontal?
2. A hammer falls from a scaffold on a building 50.0 m above the ground. Find its speed as it hits the ground.