Q. A frictionless track $ABCDE$ ends in a circular loop of radius $R$. A body slides down the track from point $A$ which is it $a$ height $h = 5\ cm$. Maximum value of $R$ for the body to successfully complete the loop is
A) $5\ cm$
B) $\frac{15}{4}\ cm$
C) $\frac{10}{3}\ cm$
D) $2\ cm$
Explanation
(d) Condition for vertical looping
$h = \frac{5}{2}r = 5cm\ \therefore r = 2\ cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.