A rocket in space fires its engines continuously until it runs out of fuel. Describe the motion of the rocket.
A. The rocket's speed is a constant value until the engines stop firing, and then coasts to a stop.
B. The rocket's speed increases until its engines stop firing, and then coasts to a stop.
C. The rocket does not move, as the engines have nothing to push against.
D. The rocket's speed does not change, and it continues to move in a straight line.
E. The rocket's speed increases until its engines stop firing, and then coasts in a straight line.
Answer: E
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