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An unbanked curve has a radius of 60 m. ...

An unbanked curve has a radius of 60 m. The maximum speed at which a car can make a turn if the coefficient of static friction is 0.75, is

A

2.1 `m//s`

B

14 `m//s`

C

21 `m//s`

D

7 `m//s`

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