Two movers have to lift a refrigerator onto a truck. one of the movers want to lift the refrigerator vertically but the other mover wants to roll it up a ramp by applying a force parallel to the ramp. assume the height of the truck is 1.5 m the length of the ramp is 5 m and the weight of the refrigerator is 1200 N. Calculate the force and the total work required in each case. which method is easier?