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Q.

A car of mass 900 kg negotiates a horizontal curve of mean radius 100 m. If the coefficient of static friction between the tyres and road surface is 0.4, the permissible speed of the car is [Take g=10 m/s2]

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a

10 m/s

b

20 m/s

c

15 m/s

d

30 m/s

answer is B.

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Detailed Solution

The car will not skid if mV2R≤μmg∴ Vmax⁡=μRg=0.4×100×10 m/s=20 m/s
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