A body of mass m is made to revolve alon...

A body of mass m is made to revolve along a circle of radius r in horizontal plane at a speed `Vm//s` with help of light horizontal string such that the tension in the string is 10 N. Keeping speed constant if mass is increased to 2m und radius is decreased to `r//2` then tension in the string is

10N

20N

40N

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