An engineer is designing a loop for a roller coaster. If the loop has a radius of 25 m, how fast do the cars need to be moving at the top to ensure people would be safe even if the safety bars malfunctioned?
(A) 12.7 m/ s
(B) 15.8 m/ s
(C) 21.2 m/ s
(D) 29.3 m/ s
(E) 33.3 m/ s
Answers: 3
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