If a ski lift raises 100 passengers averaging 656 N in weight to a height of 145 m in 60 s, at constant speed, what average power is required of the force making the lift? I know average power is P=W/t, where W is work and t is change in time. Since work is w=fd, I did 656 N*145 m and then took that number and multiplied it by 100 for the 100 passengers. I then took this product and divided it by the change in time, 60 seconds, and I got 158533 W for the average power, and it's wrong. Am I just misunderstanding the problem, or am I really doing this wrong?