alleryStart learning →A car on a convex bridge of radius 40 m loses contact with the road at what speed? (g = 10 m/s²)
A20 m/s
B10 m/s
C40 m/s
D30 m/s
Answer & Solution
Correct answer: A. 20 m/s
Contact is lost when N = 0, so v = √(rg) = √400 = 20 m/s.
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