an ideal pendulum oscillates in vacuum between two extreme position A and B if it goes from position a to position B and then returns to from position between position and C in 3 seconds then it will completely 3.5 oscillations in how many seconds
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A To b and b to a will be 4s as 75% of its oscillation is 3s
So 3.5 osc will take =4*3.5=.14s
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