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Q.

A self-propelled vehicle (assume it as a point mass) runs on a track with constant speed v. It passes through three positions A, B and C on the circular part of the track. Suppose NA,NB and NC are the normal forces exerted by the track on the vehicle when it is passing through points A, B and C respectively then

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a

NA=NB=NC

b

NB>NA>NC

c

NC>NA>NB

d

NB>NC>NA

answer is B.

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Detailed Solution

mgcos⁡θ−N=mv2RN=mgcos⁡θ−mv2RHence N decrease as θ increases.
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A self-propelled vehicle (assume it as a point mass) runs on a track with constant speed v. It passes through three positions A, B and C on the circular part of the track. Suppose NA,NB and NC are the normal forces exerted by the track on the vehicle when it is passing through points A, B and C respectively then