If an object is moving in a straight line due west with its speed changing, the net force acting on the object must be west must be zero could be east, west or zero must be east must be east or west

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Q: I tried this and it is incorrect. Is there any other route to an answer?

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Q: my quiz shows the answer as 10?

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Q: the answer is 1.5 but I'm not sure how to get it. can you please explain it ?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!