The co-efficient of friction in the longitudinal direction

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The co-efficient of friction in the longitudinal direction of a highway is estimated as 0.396. The breaking distance for a new car moving at a speed of 65 km/hr is

1. 87 m
2. 45 m
3. 42 m
4. 40 m

Correct Option: C

Braking distance,

S =	V²
	2gƒ

=	18.055²
	2 × 9.81 × 0.396

≈ 42 m