Answer 2_4_5

Momentum before = 0.25 kg × + 0.3 m/s = 0.075 kg m/s

Momentum after = 0.075 kg m/s = (0.25 kg + 0.1 kg) × v

 v = 0.075 kg m/s ÷ 0.35 kg = 0.21 m/s (from left to right)

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