A van is moving with speed of 108 km/hr. on level road where coefficient of friction between tires and road 0.5. For the safe driving of van the minimum radius of curvature of the road will be (g = 10 m/s2)
80 m
40 m
180 m
20 m
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A pulley one metre in diameter rotating at 600 r.p.m. is brought to rest in 80 sec. by a constant force of friction on its shaft. How many revolutions does it makes before coming to rest?