A spaceship moves in outer space. What happens to its motion if there are no external forces exerted on it? If there is a constant force exerted on it in the direction of its motion? If something exerts a force opposite its motion?
a. It keeps moving; it speeds up with constant acceleration; it slows down with constant acceleration.
b. It slows down; it moves with constant velocity; it slows down.
c. It slows down; it moves with constant velocity; it stops instantly.
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