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PRACTICE / Recoil

A launcher recoils

A launcher of mass 4 kg initially rests with a 0.020 kg projectile. It fires the projectile at +200 m/s relative to the ground.

Find the launcher velocity immediately after firing.

Organize the givens & assumptions
  • M = 4 kg
  • m = 0.020 kg
  • vprojectile = +200 m/s

Initially stationary isolated horizontal system; negligible external impulse; projectile speed is relative to ground.

  1. A−1 m s−1-1\ \mathrm{m\,s^{-1}}
  2. B1 m s−11\ \mathrm{m\,s^{-1}}
  3. C−4 m s−1-4\ \mathrm{m\,s^{-1}}
  4. D0 m s−10\ \mathrm{m\,s^{-1}}

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