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A shopper pushes a grocery cart 25.74111 at constant speed on level ground, against a 56N frictional force. He pushes in a direction 25D below the horizontal. a) What is the work done on the cart by friction? J Gravitational force? b) What is the work done on the cart by the b J c) What is the work done on the cart by the shopper? J d) Find the force the shopper exerts, using energy considerations J e) What is the total work done on the cart? J How much work is done by the boy pulling his sister 30 III in a wagon as shown? Assume n0 friction acts on the wagon. J A 94.26 kg person climbs stairs, gaining 2.82 In in height. Find the work done to accomplish this task. J Calculate the value for the kinetic energy of an aircraft carrier with a weight of 5.5 x 109 N, moving at a speed of 32 m/s. J