Question

A small block is shot into each of the four tracks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the track is the same in all cases. At the highest point of the track, the normal reaction is maximum in

Answer 1

.........(A)..........

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Answer 2

Answer:

A

Explanation:

Height of the track = h = constant (Given)

Speed of the track = s = same (Given)

Let velocity at the highest point be = v0 ( N+mg) - providing centripetal force to the body.

where N is the normal reaction

Normal reaction at the highest point - R=mv²/r−mg    

where r is the radius of curvature        

Since, reaction is inversely proportional to the radius of the curvature of path and radius is minimum for path is depicted in figure A.