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Question

A vehicle is travelling along concave road then along convex road of same radius of curvatures at uniform speed. If the normal reactions on the vehicle as it crosses the lowest point of concave surface, highest point of convex surface are 1.5×104N,0.3×103N respectively, the mass of vehicle is: (g=10m/s2)
  1. 400 kg
  2. 450 kg
  3. 900 kg
  4. 800 kg

A
900 kg
B
450 kg
C
800 kg
D
400 kg
Solution
Verified by Toppr

Speed is uniform:
At point B: N1mg=mv2R(1)
At point D: mgN2=mv2R(2)
(1)(2)
N1+N2=2mg

(1.5+.3)×104=2mg

m=900kg

63660_19788_ans_3b5ed2d716f44bde9393f0d697d8379c.PNG

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