A particle of maas m is attched to a light string of length l, the other end of which is fixed. Initially the string is kept horizontal and the particle is given an upwrd velocity v. The particle is just able to complete a circle

Options

A. `(i),(ii)`
B. `(ii),(iii)`
C. `(i),(iv)`
D. `(ii),(iv)`

Answer

C

Explanation

`T+mg=(mv^(2))/(L)impliesT=0,(i)is O.Kgt`
`v'^(2)=v^-2gL`
`gL=v^(2)-2gLimpliesv^(2)=3gL`
`(1)/(2)mv^(2)=(3mL)/(2),(iii)"is wrong"`.