Answer:
The work done is 90kJ, with power delivered 30kJ/s.
Explanation:
Work done is proportional to the product of force and displacement. Assuming the motion is in a straight line and the force acts along that line only, the work is calculated as follows:
[tex]W = F\cdot d=\frac{1}{2}m(at)^2=\frac{1}{2}mv^2\\W=0.5\cdot 800kg\cdot 15^2\frac{m^2}{s^2}=90000J[/tex]
The work done is 90kJ.
The power is work done per time unit:
[tex]P = \frac{W}{\Delta t}=\frac{90000J}{3s}=30kJ/s[/tex]
The power delivered in the 3 seconds is 30kJ/s
