The displacement parallel to ramp is 5 meters and I understand how 1800=F(5)cos(0) produces the correct answer but I do not understand why I can not use the applied force and the vertical displacement along with the angle between them (72.5) to get the same answer.
My teacher told me that answers are F=1200 N for lifting straight up and F= 360 N for using the ramp. I can get the force for lifting straight up by using 1800=F(1.5)cos(0) but I do not understand why for using the ramp the equation 1800 = F(1.5)cos(72.5) does not produce the correct answer.