Question

Consider a particle is moving with a minimum speed 'v' and is at highest point of
veitical circle of radius 'R'. If the radius of the circle doubled the corresponding
minimum speed will be​ .

Answer 1

Answer:

2V

Minimum speed for a particle at the lowest point of a vertical circle is given by

V=5gr

where, g is the acceleration due to gravity & r is the radius of the circle.

Thus, V∝r

Hence when radius is reduced to one-fourth V will reduce by half.