A man pushes a cart 25m at a constant speed on ground level, against a 36N frictional force. He pushes in a direction that is 28.5 degrees below the horizontal.  A. What is the work done by gravity, friction, and the man? B. Find the force in N that the shopper exerts using energy consideration. (give your answer as a magnitude) C. What is the total work done by all forces on the cart?

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.