A Spaceship with a Mass Of $20,000 \mathrm{~kg}$ Is Traveling in a Straight Line at a Constant Speed

Multiple Choice

A spaceship with a mass of $20,000 \mathrm{~kg}$ is traveling in a straight line at a constant speed of $300 \mathrm{~km} / \mathrm{s}$ in deep space. Its rockets engines must be:

A) off
B) firing