At time t = 0, a rock climber accidentally allows a piton to fall freely from a high point on the rock wall to the valley below him. Then, after a short delay, his climbing partner, who is 10 m higher on the wall, throws a piton downward. The positions y of the pitons versus r during the falling is given in Figure. With what speed is the second pitonthrown?

Transcribed Image Text:

3. 1 (s)