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NEET Class neet Answered

plzz solve this
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Asked by surabhilakhara7299 | 10 Jul, 2021, 12:49: AM
answered-by-expert Expert Answer
Workdone by the force to lift a mass m to a height h = ( m g h ) 
 
Workdone by force against friction force = friction force × distance = ( μ m g ) × begin mathsize 14px style square root of h squared plus l squared end root end style
Total workdone  W = [ ( m g h ) + ( μ m g ) × begin mathsize 14px style square root of h squared plus l squared end root end style ]  = (mgh) [ 1 + μ begin mathsize 14px style square root of 1 space plus space open parentheses l over h close parentheses squared end root end style ]

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