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Elastic and Inelastic Collisions

AP Physics 1· difficulty 2/5

3 kg 2 kg +4 m/s −1 m/s

Two carts approach each other on a frictionless track and stick together at collision. Common velocity afterward?

  • A

    +1.5 m/s+1.5~\text{m/s}

  • B

    +2.0 m/s+2.0~\text{m/s}

    check_circle
  • C

    +3.0 m/s+3.0~\text{m/s}

  • D

    +5.0 m/s+5.0~\text{m/s}

Explanation

pi=(3)(4)+(2)(−1)=12−2=10p_i = (3)(4) + (2)(-1) = 12 - 2 = 10. v′=10/5=2.0 m/sv' = 10/5 = 2.0~\text{m/s}.

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