(3) 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 chants m=53kg {b} How much work [in J) does she do if her center of mass rises 0.260 m? |:|J {c} what is her useful power output (in W} if she does 24 pushiups in 1 mln? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) |:|W