Question

Find the work done by a man weighing $140kg$ and carrying $20kg$ load to the top of a ladder $16m$ long making an angle of ${30}^o$ with the horizontal$g=9.8m/s^2$

Answer 1

Given,

Mass of the man is $140kg$

Weight of load $m=20kg$

Length of ladder$L=16m$

Angle$\theta ={30}^0$

So, Total mass $M=140+20=160kg$

$g=9.8m/s^2$

Height $h=L\sin {30}^o=16\times 0.5=8m$

Work done $W=Mgh=160\times 9.8\times 8=1.2544\times {10}^{4}J$