Laws of Motion - Result Question 59

59. A car of mass 1000kg negotiates a banked curve of radius 90m on a frictionless road. If the banking angle is 45, the speed of the car is :

(a) 20ms1

(b) 30ms1

(c) 5ms1

(d) 10ms1

[2012]

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Answer:

Correct Answer: 59. (c)

Solution:

  1. (c) For banking, tanθ=V2Rg

tan45=V290×10=1

V=30m/s

If friction is present then maximum safe speed, on

a banked frictional road, V=Rg(μ+tanθ)1μtanθ



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