A car is travelling with uniform speed on a flyover bridge which is a part of vertical circle whose radius of curvature is 60m. A person in that car feels 75% decrease in his weight when the car is crossing highest position. The speed of car at that position is:
28m/s
21m/s
14m/s
7m/s
A
7m/s
B
21m/s
C
28m/s
D
14m/s
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Solution
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Since the weight decreased by 75%, the centripetal force acting upwards must be equal to 3mg4
Hence mv2R=3mg4 ⟹v=√3gR4
⟹v=21m/s
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