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Concepts of PhysicsA shopper pushes a grocery cart 20.0 m

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Concepts of PhysicsA shopper pushes a grocery cart 20.0 m at constant
speed on level ground, against a 35.0 N frictional force. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c) What is the work done on the cart by the shopper? (d) Find the force the shopper exerts parallel to the direction of motion. (e) What is the total work done on the cart?
please show work

 
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