T = k√L
So, T/√L is constant.
So, you want to find L such that 15/√9 = 80/√L
and T such that 15/√9 = T/√36
THE TIME OF A PENDULUM VARIES AS THE SQUARE ROOT OF IT LENGHT IF THE LENGTH OF A PENDULUM WHICH BEAT 15S IN 9CM FIND A THE LENGHT THAT 80SECONDS B THE TIME OF A PENDULUM WITH LENGHT 36CM
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