Answer :


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 2nd law of motion,

Fnet = mg-T

Fnet = mv12/R (Centrifugal force)

mg-T = mv12/R …(1)


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,

Fnet = T + mg

Fnet = mv22/ R


v2 = velocity of body at highest point,

T + mg = mv22/ R …(2)

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

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