Question

How much work is done by pulling up on a suitcase at 40° elevation with a force of 5.00lb while moving it horizontally 1320.ft?

Answer 1

Explanations & Calculations

• If the distance it travelled on the incline is $\small x$, then,

$\qquad\qquad \begin{aligned} \small x\cos40&=\small 1320\,ft\\ \small x&=\small 1723\,ft\\ \end{aligned}$

• Then the work in foot pound units is

$\qquad\qquad \begin{aligned} \small W&=\small 1723\,ft\times5.00\,lb\\ &=\small 8615\,ft.lb \end{aligned}$