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# 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)400 kg450 kg900 kg800 kg

A
900 kg
B
450 kg
C
800 kg
D
400 kg
Solution
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#### Speed is uniform:At point B: N1−mg=mv2R−−−−(1)At point D: mg−N2=mv2R−−−−−(2)(1)−(2)N1+N2=2mg(1.5+.3)×104=2mgm=900kg

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