A block of weight w sits on a frictionless inclined plane, which makes an angle

Question

A block of weight w sits on a frictionless inclined plane, which makes an angle (theta) with respect to the horizontal, as shown. A force of magnitude F , applied parallel to the incline, pulls the block up the plane at constant speed.

The block moves a distance L up the incline. The block does not stop after moving this distance but continues to move with constant speed. What is the total work Wtot done on the block by all forces? (Include only the work done after the block has started moving, not the work needed to start the block moving from rest.)???

I need help... don't know the answer, it isn't wL sin(theta)

Explanation / Answer

Part A (total work done)is equal to zero because F= mgsin theta

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