A 70·kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 37.0° above the horizontal. The tension in the rope is 180·N and the crate moves 4.1·m.
(a) How much work is done by the rope on the crate? J
(b) What is the total work done on the box by all forces? J
(c) How much work is done by friction on the box? J