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A small block of mass m = kg is fired with an initial speed $$v_0$$ = m/s along a horizontal section of frictionless track, as shown in the top portion of the figure. The block then moves along the frictionless semicircular vertical track of radius $$R$$ = m.

Part 1#

Determine the force exerted by the track on the block at point A.

Please enter in a numeric value in .

Part 2#

The bottom of the track consists of a horizontal section (L = m) with friction. Determine the coefficient of kinetic friction between the block and the bottom portion of the track if the block just makes it to point B before coming to rest.