To pull a 50 kg crate across a horizontal frictionless floor, a worker applies a force of

Question:

To pull a 50 kg crate across a horizontal frictionless floor, a worker applies a force of 210 N, directed 20o above the horizontal. As the crate moves 3.0 m, what work is done on the crate by
(a) The worker's force,
(b) The gravitational force on the crate, and
(c) The normal force on the crate from the floor?
(d) What is the total work done on the crate?