A pendulum is pulled back to a height of 1.9 meters (position B in the diagram. How fast will it be moving when it reaches the bottom of its swing (position R)? Did my teacher write the question wrong because I see no way of finding a solution considering how he didn't provide a weight?

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