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A person pushes a 16.0-kg shopping cart at a constant velocity of a distance of 26.0 m. She pushes in a direction 20.0degrees below the horizontal. A 54.0 N frictional force opposes the motion of the cart.

A. What is the magnitude of the force that the shopper exerts?
B. Determine the work done by fricitonal force?
C. Determine the work done by gravitational force?

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