According to Galileo's Law of Inertia, an object is acting as if it is not under any outside influence if it is moving

(A) around a circle at constant speed.
(B) in a straight line at changing speed.
(C) in a straight line at constant speed.
(D) around a circle at changing speed.

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According to Galileo's Law of Inertia, an object is acting as if it is not under any outside influence if it is moving

(A) around a circle at constant speed.

No. Its acceleration is not zero. Try again.

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According to Galileo's Law of Inertia, an object is acting as if it is not under any outside influence if it is moving

(C) in a straight line at constant speed.

Yes. Its acceleration vector is then zero.
 Check the other answers.

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According to Galileo's Law of Inertia, an object is acting as if it is not under any outside influence if it is moving

(B) in a straight line at changing speed.

No. Its acceleration would not be zero. Try again.

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According to Galileo's Law of Inertia, an object is acting as if it is not under any outside influence if it is moving

(D) around a circle at changing speed.

No. Its acceleration would not be zero. Try again.

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