How much work does it take to raise a $7 k g$ $7 kg$ weight $28 m$ $28 m$ ?

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Answer 1 · 2016-01-03T06:03:15

Work $= 1920.8 J$ $=1920.8J$

Data:-

Mass $= m = 7 k g$ $=m=7kg$
Height $=$ $=$ displacement $= h = 28 m$ $=h=28m$
Work $= ? ?$ $=??$

Sol:-
Let $W$ $W$ be the weight of the given mass.
W=mg=7*9.8=68.6N

Work $=$ $=$ force*displacement $= W \cdot h = 68.6 \cdot 28 = 1920.8 J$ $=W*h=68.6*28=1920.8J$
$\Rightarrow$ $implies$ Work $= 1920.8 J$ $=1920.8J$

How much work does it take to raise a 7kg7 kg weight 28m28 m ?