A Roller Coaster Starts from Rest at a Height H

question 64

Multiple Choice

A roller coaster starts from rest at a height h at the left side of a loop-the-loop,as shown in the figure.It is not attached to the track in anyway,and there is no friction from the track or from air resistance.If the radius of the loop is R = 6.0 m,what is the minimum height h for which the roller coaster will not fall off the track at the top of the loop?

• A)21 m
• B)18 m
• C)15 m
• D)12 m
• E)8.5 m

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