Problem C13:
A baseball of mass m is hit at an angle of 30 degrees with a speed of
n_{1}v_{0}. The baseball is caught by an outfielder
at the same height that it was hit. The speed of the ball when caught
is n_{2}v_{0}. How much work was done by the frictional forces
(mainly air friction) on the ball. If the work done by friction is
W_{f} = n_{3} mv_{0}^{2}/2,
what is the value of n_{3}. Note that n_{1}, n_{2},
and n_{3} are unitless.

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