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I have to return to something like my previous example. I stretch and
then release a mass on a horizontal spring (on the surface of a
heavy, frictionless table with the other end of the spring attached
to a post on the table). System A = mass. System B = spring + table.
System B does work W_A on the mass as the spring relaxes.
Consequently the mass gains KE.
Now for the key question: How much work W_B does the mass do on
system B? Justify your answer.
Neglect the friction between the skates and the ice and assume that a
person of mass m pushes off a rigid, stationary wall starting from
rest by extending his arms a distance d,