1. The problem statement, all variables and given/known data A stone is thrown upward from the edge of a cliff, reaches its maximum height, and then falls down into the valley below. A motion diagram for this situation is given, beginning the instant the stone leaves the thrower’s hand. Construct the corresponding motion graphs taking the acceleration due to gravity as exactly 10m/s2 . Ignore air resistance. In all three motion graphs, the unit of time is in seconds and the unit of displacement is in meters. In plotting the points, round-off the coordinate values to the nearest integer. I need to make three graphs with the vertical displacement, vertical velocity, and vertical acceleration. The graphs are from t=0 to t=6 s. I attached a screenshot of the diagram they gave me. 2. Relevant equations V=V0+at y=y0+V0t+0.5at2 3. The attempt at a solution I need to find the initial velocity! It doesn't tell me. I'm not sure if I can find the initial velocity from what is given. The image shows that the highest point is at t=2s. But does that mean that v=0 at that point?? There seems to be two points up there.. It's confusing me. Can I use V = V0+at to find it? I already tried doing that and I got 20 m/s from (at the highest point): 0=V0+(-10m/s2)(2 s) Another thing! Is the gravitational acceleration negative? The question didn't tell me which direction is positive! How am I supposed to know?? So is V0= 20m/s??