Shohei Ohtani is about to hit a baseball with his bat in batting practice. The mass of the baseball is 0.15 kg and the mass of the wooden bat is 1 kg. The ball is thrown from the pitcher and the velocity of this ball just before Ohtani's bat makes contact with the ball is +41 m/s. The velocity of the ball is 70 m/s but in the opposite direction to it's original motion immediately after it collides and leaves Ohtani's bat. If the coefficient or restitution between the bat and the ball is 0.57 determine the velocity of Ohtani's bat just before it makes contact with the ball in m/s.

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