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22 November, 10:56

1. John has to hit a bottle with a ball to win a prize. He throws a 0.4 kg ball with a velocity of 18 m/s. It hits a 0.2 kg bottle, and the bottle flies forward at 25 m/s. How fast is the ball traveling after hitting the bottle?

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  1. 22 November, 11:14
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    0.4 x 18 = 7.2 kg m/s

    The momentum of the bottle after being hit is 0.2 x 25 = 5 kg m/s

    7.2 - 5 = 2.2 kg m/s is the motmentum of the ball now

    the velocity is 2.2/0.4 = 5.5 m/s
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