15. Sandra decided to talk a walk at her neighborhood park. She walks 20 meters east, 40 meters west, and finally 50 meters east. What is her total distance
and displacement, respectively?

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