Question

A frictionless track abcde ends in a circular loop of radius r. a body slides down the track from point a

Answer 1

hiii the answer is given in picture

Answer 2

while moving from A to B

$PE_{A}$=$KE_{B}$

mgh=1/2 mv²

v=√2gh

but for vertical motion;

v=√5Rg

equationg both;

√2gh=√5Rg

(h=5)

2=R