A car is moving in a circular horizontal track with a constant speed. The centripetal force acting on the car is 75N . If the car’s speed is doubled, what is the new centripetal force required for the car to drive on the same circular track?
A
150N
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B
37.5N
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C
75N
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D
300N
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Solution
The correct option is D300N Let, mass of a car be m
Radius of circular track be r
Initial speed of car be v1
Final speed of car be v2
As car's speed is doubled, v2=2v1,
We know that the centripetal force Fc is, Fc=mv2r
For same mass and radius of curvature(as the particle is rotating in same circular path)