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(a) Calculate the force (in N) the woman in the gure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.) (b) How much work (in J) does she do if her center of mass rises 0.200 m? :1 (c) What ls her useful power output (in W) if she does 24 pushups in 1 mln? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) :IW