The bob of a pendulum at rest is given a sharp hit to impart a horizontal velocity , where l is the length of the pendulum.

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Q: The bob of a pendulum at rest is given a sharp hit to impart a horizontal velocity , where l is the length of the pendulum. The tension in the string when the string makes an angle of 60° with the upward vertical is

(a) 5 mg

(b) 6 mg

(c) 4 mg

(d) 7 mg

Ans: (a)

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