Calculate the work done by an 91.0-kg man who pushes a crate 4.00 m up along a ramp that makes an angle of 20.0 with the horizontal. (See Figure 7.35.) He exerts a force of 512 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp