A worker uses a ramp to slide a refrigerator onto the back of the truck. The ramp is 5.0m long, and raises the refrigerator 1.5m above the ground. The amount of work done by the worker is 1800J. What is the magnitude of the force the worker must exert to load the refrigerator? Ok so the first thing I did was calculate the angle by doing tangent^-1 (1.5/5.0) and got 17 degrees. Then I multiplied cos(17) and and 5.0 and divided it by 1800. When I looked on the answer sheet it said the force was 3.6X10^2. I got 376.4. What did I do wrong?! I figured you calculate the angle since he is pushing the fridge at that degree up the ramp. Isn't the formula W=Fd(cosθ)? The answer sheet said I shouldn't have the degree, why?