On the left is the problem. On the right is what I came up with. The question is to calculate the work done by "The truck on the crate (Normal force)", "The Earth on the crate (perpendicular to truck bed)", "The Earth on the crate (parallel to truck bed)", and "Friction".

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?