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[" A ball of mass "50" g moving at a spe...

[" A ball of mass "50" g moving at a speed of "20m/s" strikes "],[" a plane surface at an angle of incidence "45^(@)" .The ball is "],[" reflected by the plane at equal angle of reflection with "],[" the same speed.Calculate (a) the magnitude of the "],[" change in momentum of the ball (b) the change in the "],[" magnitude of the momentum of the ball."]

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