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Q.
A crane lifts a mass of $100\, kg$ to a height of $10\, m$ in .$20\, s$. The power of the crane is (Take $g = 10\, m s^{-2}$)
Work, Energy and Power
Solution:
Here, $m=100\, kg$
$h=10\, m ,$
$t=20\, s ,$
$g=10\, ms ^{-2}$
$g=10\, ms ^{-2}$
The power of the crane is
$P=\frac{m g h}{t}$
$=\frac{(100\, kg )\left(10\, ms ^{-2}\right)(10\, m )}{(20\, s )}$
$=500\, W$