All of the following are part of sea-floor spreading except a. sea levels rising b. plates moving closer together c. magma filling in gaps in oceanic plates d. trenches forming in the bottom of the ocean floor.

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