AP Physics 1mediummcq1 pt
A roller coaster car at the top of a hill has zero normal force. Its speed at that instant (hill radius r) is
A.√(gr)
B.gr
C.g/r
D.2√(gr)
Explanation
Core Concept
Gravity alone supplies mv²/r: mg = mv²/r gives v = √(gr).
Correct Answer
A√(gr)
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