After reading a book, julio looks out of the window and sees clouds in the distance. which change allows julio to clearly see the clouds after looking at his book? a. his corneas become flatter b. his lenses change shape c. his optic nerves begin sending signals d. his vitreous humor becomes denser

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