3. A girl and a boy each exert a force to move a crate horizontally a distance of 13 m at a constant speed. The girl's applied force is 75 N[22 below the horizontal]. The tension in
the rope pulled by the boy is 75 N [32° above the horizontal].
a) Determine the total work done by the girl and the boy on the crate.
b) How much work is done by the floor on the crate?