Question

the minimum speed for a body at the lowest point such that it just completes a vertical circle r when tied to a string l if the string length is reduced to l/4th the body should have at lowest vertical circle with minimum speed is​

Answer 1

Answer:

Velocity at lowest point is

5gℓ

v∝

ℓ

v

2

v

1

=

ℓ

2

ℓ

1

=

R/4

R

=

4

⇒v

2

=

2

v