Which of the following statements about motion are true? Select all that apply.
A. If an object is changing direction, a force must be acting on it.
B. If an object is changing speed, a force may or may not be acting on it.
C. An object can move to the right only if a force is pushing or pulling it to the right.
D. An object that is moving through outer space far from any other objects will keep moving in a straight line indefinitely.
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