Answered: A sled and rider, weighing 30 lb and… | bartleby

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A sled and rider, weighing 30 lb and 150 lb, respectively,
travel down a smooth slope that has the shape shown. If the
rider does not hold on to the sides of the sled, determine the
normal force which he exerts on the sled when the sled is
(a) at point B, where it has a velocity of 15 ft/s, and (b) at
some point C in mid air.

20 ft
20 ft
A
y = 20 cos
-20 ft-
플
X
14
-20 ft-
B

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