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>>Class 11
>>Physics
>>Laws of Motion
>>Problems on Dynamics of Circular Motion
>> $A fly - over bridge is a part of a verti$

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

$42 m / s$

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Updated on : 2022-09-05

Solution

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Correct option is C)

For the vehicle not to leave the surface, it has to travel with critical velocity.
So, $v = g R$
       $= 9.8 \times 80$
   $= 784$
or, $v = 28 m s^{- 1}$

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