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प्रश्न
उत्तर
G = 9.8 ms-2
Time, T for seconds pendulum = 2 s
Now, T= 2 `pisqrt(l/g)`
T2 = 4π2 l/g
L = T2g/4π2
= 22 x 9.8/4 x 3.142
=0.994 m
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