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A toy cart is tied to the end of an...

A toy cart is tied to the end of an unstrectched string of length 'l' when revolved , the toy cart moves in horizontal circle with radius '2l' and time period T. IF it is speeded until it moves in horizontal circle of radius '3l' with period `T_(1) ,` relation between `T and T_(1) ` is (Hooke 's law is obeyed )

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