(a) Calculate the force (in N) the woman in the figure below exerts to do a pushiup 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 0.260 m? :1 (c) What is her useful power output (in W) if she does 30 pushiups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) :W