Jeffrey is riding his skateboard down a straight road at 65 meters per minute. gwen is riding her skateboard twice as fast as jeffrey. if her velocity stays constant, how far will gwen skate in 7 minutes?

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