Physics

Problem

2000\,\text{kg}

rocket coasts in deep space with no external forces acting on it. It ejects

100\,\text{kg}

of exhaust gas in

2.0\,\text{s}

at a speed of

500\,\text{m/s}

relative to the rocket. Immediately after the exhaust is expelled, what is the rocket’s average acceleration during the

2.0\,\text{s}

interval? a)

25\,\text{m/s}^2

12.5\,\text{m/s}^2

0\,\text{m/s}^2

13.2\,\text{m/s}^2