Answer
$2.7\times10^5 W$
Work Step by Step
Given that the speed of elevator is constant that's why there is no net force, hence tension in cable is equal to weight of the elevator.
Mathematically:
$T=mg$
Putting in the values
$T=3\times10^3\times9.8=29400N$
Thus the work done by the tension in cable is
$W=Td=29400\times210=6174000J=6.17\times10^6J$
By definition, the rate of doing work is called power so
$P=\frac{W}{\Delta{t}}$
Enter the values
$P=\frac{6.17\times10^6}{23}$
$P=2.7\times10^5W$
