A particle of mass `m` is attached to one end of a light inextensible string and the other end of the string is fixed in vertical plane as shown. Particle is given a horizontal velocity `u = sqrt((5)/(2)gl)`
The tension in the string at an instant when acceleration of the particle is horizontal and `sqrt(3)g` is
A. mg
B. 2 mg
C. 4 mg
D. 6 mg
