Connor lifts a 1,500 N barbell above his head from the floor to a height of 2m. He holds the barbell there for 5 sec.
a. How much work does he do lifting the barbell?
B. How much work does he do during the 5 second interval?

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f