Jane, looking for Tarzan, is running at top speed (5.6 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward? I know the answer is 1.6 m, but I don't understand how to get it. In class, we have been using the equation: 1/2mv^2 + mgy = 1/2mv^2 + mgy (where the first pt. of the equation is v1 and y1, and the second pt. v2 and y2. I don't understand how you would solve it if 5.6 m/s is the only number you have. I think it has something to do with gravity, but I'm not sure what. Please show me how to solve it. Thanks!