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A van is moving with speed 72 kmph on a level road, where $μ = 0.5$ between tyres and road The minimum radius of curvature the road must have for safe driving of van is

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80m

400m

20m

10m

answer is A.

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Detailed Solution

$v = \sqrt{μ r g}$

$20 = \sqrt{0.5 \times r \times 10}$

$400 = 5 r$

$r = 80 m$

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