Question

A small body tied to a string is revolved in a vertical circle of
radius 0.8 m such that its speed at the top of the circle is 4 m/s.
Find the maximum SPEED of the body during the motion ?

Answer 1

Correct option is A)

At lowest point V

2

=

5gR

and at highest point V

1

=

gR

∴ At lowest point T

2

−mg=

R

mν

2

→T

2

=mg+5mg=6mg

At highest point T

1

+mg=

R

mν

2

T

1

=0

∴T

2

−T

1

=6mg