A child runs in a straight line tangent to a playground car- ousel, jumps on, an

Question

A child runs in a straight line tangent to a playground car-
ousel, jumps on, and holds tight as the carousel begins to
rotate. Which of the following statements is correct for this
collision? (a) The coefficient of restitution is greater than 1
because there is now rotational energy where there was none
before. (b) The coefficient of restitution is 1 because the

system%u2019s translational kinetic energy is completely converted
to rotational kinetic energy. (c) The coefficient of restitution
is less than 1 because the sum of the translational and rota-
tional kinetic energies in the final state is less than the sum in
the initial state. (d) The coefficient of restitution cannot be
defined in a system in which there is both translational mo-
tion and rotational motion. (e) Explain why all the answers
except the one you chose are wrong.

Explanation / Answer

c)

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