Answer
235 kW
Work Step by Step
Power is the dot product of force and velocity.
$P=\vec{F}\cdot\vec{v}=Fv\cos\theta$ where $\theta$ is the angle between force vector and velocity vector.
In this case, $F=mg=(4500+1800)9.8\,m/s^{2}$
$v=3.80\,m/s$ and $\theta=0^{\circ}$ as force vector is along velocity vector.
Therefore, $P=6300\,kg\times9.8\,m/s^{2}\times3.80\,m/s\times\cos0^{\circ}$
$=235\,kW$
