Question

a pendulum bob is given velocity u = root(7gr/2) at lowest point where r is length of the string then the minimum velocity of bob in subsequent motion is

Answer 1

Answer:

Velocities are critical:

V=

gR

H=R(1−cos 60

0

)

=

2

3R

Apply Work Energy Theorem between A and B,

2

3

mgR=

2

mV

0

2

−

2

m(

gR

)

2

⟹2

gR

=V

0

V

0

=2V

Explanation:

hope it is helpful