1.

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` :

Answer» Correct Answer - 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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