Help with this question please

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

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