1. The problem statement, all variables and given/known data The maximum power your body can deliver in lifting an object vertically is 78 W. How fast could you lift, at constant speed, a 2L full water container? P=78W m=2kg t=? v=? 2. Relevant equations P=ΔE/t E=1/2mv2 3. The attempt at a solution 78W=(.5*m*v2)/t t=(.5*2*v2)/78 I am unsure what to do when I have a speed constant.