Problem C6:
A block starts from rest and slides down an incline plane without friction.
the incline makes an angle of 30 degrees with the horizontal. After sliding
a distance of n_{1} down the plane it reaches the bottom and slides
on a level surface with friction a distance of n_{2} before coming to rest. The
coefficient of kinetic friction between the block and the level surface is
&mu = 1/n_{3}. What is n_{3}? Note that the distances
n_{1} and n_{2} have the same units.

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