Small Block Is Shot Into Each Of Four Tracks As Shown Below

A small block is shot into each of the four tracks as shown below. Each of the tracks rises … point of the track, the normal reaction…

Answers:

Correct Option (a) 

  Explanation: Normal reaction at the highest point of the path R = mv²/r –mg

  For maximum R, value of the radius of curvature (r ) should be minimum and it is minimum in first   condition.