The frequency of oscillations of a simple pendulum is given by: =12‾‾√ where =9.8 ms-2 and is the length of the pendulum. At the time =0 two simple pendulums with lengths 1 and 2 had the same angle relative to the vertical direction. Determine the time at which they will have the same angle relative to the vertical direction again, given that 2/1=9/25 and 1=0.2 s-1.
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