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1.

  • p=mv
    • 60 kg•m/s=(30 kg)(v)
    • 2.0 m/s=v

2.

  • ptotalbefore=ptotalafter
    • mredvbeforered+mgreenvbeforegreen=mredvafterred+mgreenvaftergreen
    • (0.5 kg)(4 m/s)+(0.3 kg)(-2 m/s)=(0.5 kg)(2 m/s)+(0.3 kg)vaftergreen
    • 1.3 m/s=vaftergreen

3.

  • ptotalbefore=ptotalafter
    • mredvred+mgreenvgreen=(mred+mgreen)vfinal
    • (0.5 kg)(4 m/s)+(0.3 kg)(-2 m/s)=(0.5 kg+0.3 kg)vfinal\
    • 1.8 m/s=vfinal

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