Question

A helicopter lifts a $72$ $kg$ astronaut, $15$ $m$ vertically from the ocean by means of a cable. The acceleration of the astronaut is $g/10$. What is the net work done on astronaut? $(g=9.8m/s^2)$

• A. 1.058 J
• B. 10.58 J
• C. 105.8 J
• D. 1058 J

Answer 1

The correct option is D 1058 J

Net work done in moving an object under application of a number of forces$=$$F_{net}\Delta s$

$=ma\Delta s$
$=72\times \frac{9.8}{10}\times 15J=1058J$