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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 11.8 m higher on the wall, throws a piton downward. The positions y of the pitons versus t during the falling are given in the figure. With what speed is the second piton thrown?

0 t (s)

0 0
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