1. An object of mass mi=3kg, moving with a velocity of 20m/s in the positive x- direction, collides with and sticks to an object of mass m2=2kg moving with a velocity of 10 m/s in the negative x-direction. What the final velocity of the composite system

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