The amplitude of an oscillating simple pendulum is $10\,cm$ and its period is $4\, sec$. Its speed after $1\, sec$ after it passes its equilibrium position, is ... $m/s$
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(a) At the time $t = \frac{T}{4} = \frac{4}{4} = 1\sec $ after passing from mean position, the body reaches at it's extreme position. At extreme, position velocity of body becomes zero.
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