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

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

Normal reaction at the highest point of the path

$R = \frac{mv^{2}}{r} - mg$

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