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All the pulleys are ideal, string is mas...

All the pulleys are ideal, string is massless then rate of work done by gravity at the given instant is `(-x xx 10^(2))W` then calculate `x` :

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The correct Answer is:
5
`v_(p) = (-5 + 15)/(2) = 5m//s`
`P = overset(vec)(F).overset(vec)(V) = -mgV`
`= -100 xx 5 = -500 W`
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