A physics TA pushes a 20.0 kg equipment cart at a constant velocity for a distance of 18.0 m down the hall. The force she exerts on the cart is directed at an angle 21.0° below the horizontal, and the force of friction opposing the motion of the cart is 50.0 N. Determine the following. a) the work done (in J) by the force the TA exerts on the cart b) the work done (in J) by the force of friction acting on the cart

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