Average power needed to lift an object

[IAmPat]

Homework Statement

A weightlifter raises a 115kg weight from the ground to a height of 1.95m in 1.25 seconds. What is the average power of this maneuver.

Homework Equations

m = 115kg
Change in Y = 1.95m
time = 1.25 seconds

The Attempt at a Solution

V = 1.95/1.25 = 1.56 m/s
a = 1.56/1.25 = 1.248 m/s/s
mg = (115)(-9.8) = -1127 N

Net Force Of Fy = (115)(1.248)
Net Fy = 143.52
Force of maneuver:
143.52 = -1127 + x
Force of maneuver = 1270.52

Work = 1270.52 * 1.95
Work = 2477.514

P = 2477.514 / 1.25 = 1,982.0112

Help?

 

[Sleve123]

Your acceleration is wrong, the 'V' you worked out was the average velocity, you can work out the acceleration using s = ut +0.5at^2.

Alternatively assume the lift is of constant velocity and say:

mgh / time = power