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Question
One end of string of length $l$ is connected to a particle of mass 'm' and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed '$\upsilon $', the net force on the particle (directed towards centre) will be (T represents the tension in the string)
$T + {{m{v^2}} \over l}$
$T - {{m{v^2}} \over l}$
zero
$T$

Solution

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