Which of die following statements is correct for the two methods a man can apply

Question

Which of die following statements is correct for the two methods a man can apply to move a heavy refrigerator as displayed in the figure. Assume the ramp is frictionless. METHOD 1: The man uses a force to the move the refrigerator at a constant velocity straight up to the truck. METHOD 2: The man uses a ramp, which makes an angle of 30 degree with the horizontal floor, to move the refrigerator at a constant velocity to the truck. Method 1 does more work than Method 2. Method 2 does more work than Method 1. The man in Method 2 applies the force equivalent to twice the amount of weight of the refrigerator in order to move it. Method 1 and Method 2 do the same amount of work. Not enough information to determine.

Explanation / Answer

The correct option is option d

The reason is that the person does same work by adding same potential energy to the object by raising it to the same leve. Here the height to which it raised is the only prominent factor since ramp itself is frictionless and hence no energy is dissipated on ramp. Hence the only work done by man in both case is just potential energy and hence the height to which it has been is the only important factor according to mgh=PE formula

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