A stone of

Given:

Mass of body = m Kg

Radius of vertical circle = R m

From the free body diagram of body at lowest point, we can write,

According Newton’s 2^nd law of motion,

F_net = mg-T

F_net = mv₁²/R (Centrifugal force)

mg-T = mv₁²/R …(1)

Where,

v₁ = Velocity at lowest point.

m = mass of body

R = radius of path

T = tension in string

From the free body diagram of body at highest point , we can write,

F_net = T + mg

F_net = mv₂²/ R

Where,

v₂ = velocity of body at highest point,

T + mg = mv₂²/ R …(2)

From equation (1) and (2) we conclude that option (1) is correct.