Answer 2_4_6

Momentum before = (0.25 kg × + 0.3 m/s) + (0.1 kg  × +0.15 m/s)

                              = 0.075 kg m/s + 0.015 kg m/s = 0.090 kg m/s

Momentum after = 0.090 kg m/s = (0.25 kg + 0.1 kg) × v

 v = 0.090 kg m/s ÷ 0.35 kg = 0.26 m/s (from left to right)

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