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Conservation of Linear Momentum

AP Physics 1· difficulty 3/5

2 kg 3 kg

Blocks of 2 kg2~\text{kg} and 3 kg3~\text{kg} are at rest on a frictionless surface with a compressed spring between them. After release, the 2 kg2~\text{kg} block moves at 9 m/s9~\text{m/s}. The 3 kg3~\text{kg} block's speed (in the opposite direction) is

  • A

    6 m/s6~\text{m/s}

    check_circle
  • B

    13.5 m/s13.5~\text{m/s}

  • C

    9 m/s9~\text{m/s}

  • D

    3 m/s3~\text{m/s}

Explanation

0=2(9)+3(−v)⇒v=6 m/s0 = 2(9) + 3(-v) \Rightarrow v = 6~\text{m/s}.

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