Olaf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A friend throws Olaf a ball of mass 0.400 kgkg that is traveling horizontally at 12.0 m/sm/s . Olaf's mass is 71.1 kgkg .(Figure 1) If the ball hits Olaf and bounces off his chest horizontally at 8.90 m/sm/s in the opposite direction, what is his speed vfvfv_f after the collision? Express your answer numerically in meters per second.

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