Physics

Problem

A rifle of mass

4\,\text{kg}

fires a bullet of mass

20\,\text{g}

with a muzzle speed of

300\,\text{m/s}

relative to the ground. Neglecting external forces, what is the recoil speed of the rifle? a)

0.75\,\text{m/s}

backward b)

0.15\,\text{m/s}

backward c)

1.5\,\text{m/s}

backward d)

3.0\,\text{m/s}

backward