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Answer :
Given, mass of the ball (m) = 200 g
Initial velocity of the ball (u) = 10 m/s
Final velocity of the ball (v) = 5 m/s
Initial momentum of the ball = mu = 200 × 10 = 2000 gm/s
Final momentum of the ball = m v = 200 × 5 = 1000 gm/s
Therefore, the change in momentum (m v – m u) = 1000 – 2000 = -1000 gm/s