The equation below is the solution to a physics problem:

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The most likely physical situation it describes is
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a 2.30 kg cart rolling up a 30° incline.
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a 2.30 kg cart rolling down a 30° incline.
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a 2.30 kg cart rolling up a 60° incline.
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a 2.30 kg cart rolling down a 60° incline.
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a 2.30 kg cart rolling down a 90° incline.