Question

A man pulls a lawn roller through a distance of 20m with a force of 20kg weight. if he apllies a force at an angle of 60 degree with the ground, calculate the power developed if he takes 1 min in doing so?

Answer 1

We know,

Work done,

$w = fs \cos(x)$

Therefore,

W = 20×9.8×20×cos60°

[since, the given force is in the form of kg, that is why we'll change it in actual force by multiplying value of g=9.8m/s² to it]

W = 196N

Power = Work done × Time

P = 196 × 60
P = 11760J