A person is lifting a 250kg crate using a pulley. He is pulling the rope at an angle of 40 degrees with the pulley. The crate is
suspended in the air at 3 meters. The person lifting the crate is not strong enough to and cannot lift the crate and the crate doesn't fall down either. What is the work done by the person? What is the work done by gravity? What is the work done on the crate?
