A road of width 20m forms an arc of radius 15m, its outer edge is 2m higher than its inner edge. For what speed the road is banked?
A
√10 m/s
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B
√14.7 m/s
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C
√9.8 m/s
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D
None of these
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Solution
The correct option is B√14.7 m/s Given R=15m Let V be optimum velocity of car We know that V2=gRtanθ From triangle, tanθ=2√396 V2=10×15×2√396=300√396 V=√14.7 m/s