Question

If a man lifts a load up with the help of a rope such that it raises a load of mass $50kg$ to a height of $20m$in $100$ seconds. Find the power of man. (Take $g=10m{s}^{-2}$).

Answer 1

Step 1: Given data

Mass of the load, m = $50kg$

Height raised h = $20m$

Time is taken, t = $100s$

Acceleration due to gravity, g = $10m{s}^{-2}$

Step 2: Finding Power

We know that Power$P=\frac{mgh}{t}$; where m= mass; g= acceleration due to gravity, h= height, t = time taken

$P=\frac{50\times 10\times 20}{100}$$=100W$

Therefore, the power of the man is$100W$.