## College Physics (4th Edition)

We can find the total amount of work that Rosie does: $Work = mgh = (220~N)(4.0~m) = 880~J$ We can find the average rate that Rosie does this work: $Power = \frac{Energy}{Time}= \frac{880~J}{40~s} = 22~W$ Rosie does this work at an average rate of 22 Watts