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Maximum Push Using Friction

The coefficie...

Question

The coefficient of friction in the longitudinal direction of a highway is estimated as 0.396. The braking distance for a car moving at a speed of 65 km/hr is

A

87 m

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B

45 m

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C

42 m

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D

40 m

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Solution

The correct option is C 42 m
Braking distance
$= \frac{V^{2}}{254 f}$

$= \frac{(65)^{2}}{254 \times 0.396} = 42 m$

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