Answer: A. 305,760 J
Explanation:
Work is defined as a force causing the movement or displacement of an object.
work=[tex]mass\times acceleration\times height[/tex]
Given: m= mass = 4 kg
g= acceleration due to gravity = [tex]9.80m/s^2[/tex]
h = height = 15m
Putting in the values we get,
work=[tex]4kg\times 9.80m/s^2\times 15m=588J[/tex]
[tex]1kgm^2s^{-2}=1Joule(J)[/tex]
Now 520 bricks are to be relocated, thus work done = [tex]520\times 588J=305760J[/tex]
Thus amount of work will be needed to accomplish the task is 305760 J.
