What is the average power output of a weight lifter who can lift 260 kg from the floor to a height of 1.60 m in 1.7 seconds?

The power P is the amount of work W done in a certain amount of time t

For the law of conservation of energy, the amount of work done by the lifter is equal to the difference in gravitational potential energy of the block of mass  between its final location (height h=1.60 m) and its initial location (the floor, h=0). This potential energy difference is 


And therefore, the average power output of the lifter, using , is