A spacecraft is coasting in deep space with a uniform velocity of

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

200\,\text{m/s}

. Its engines are switched off at

t = 0

. Which option best describes its motion at

t = 600\,\text{s}

, assuming no other forces act on it? (a) It gradually slows down and eventually comes to rest. (b) It will have travelled

1.2\times10^{5}\,\text{m}

from its starting point but not necessarily at the same speed. (c) It continues to move at

200\,\text{m/s}

in the same straight line. (d) It speeds up continuously because no forces oppose its motion.