Question

# A fly-over bridge is a part of a vertical circle of radius 80 m and a vehicle is travelling on it. The vehicle does not leave the surface of bridge at its highest point, if maximum speed of vehicle is:

A
14 m/s
B
21 m/s
C
28 m/s
D
42 m/s
Solution
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#### For the vehicle not to leave the surface, it has to travel with critical velocity. So, v=√gR=√9.8×80=√784or, v=28 ms−1

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