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[" 3.) A man weighing "80kg" climbs a st...

[" 3.) A man weighing "80kg" climbs a staircase "],[" carrying a "20kg" load.The staircase has "40],[" steps,each of "25cm" height.If he takes "20],[" seconds to climb,the work done is "],[1)9800Jquad " 2) "490Jquad " 3) "98times10^(5)Jquad " 4) "7840J]

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