Answer 2_4_4

Momentum before = 0 = momentum after

- 0.25 kg × 0.3 m/s + 0.1 kg × + v m/s = 0

0.075 kg m/s = 0.1 kg  × v

v = 0.075 kg m/s ÷ 0.1 kg = 0.75 m/s (from left to right)

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