When a card placed on a glass tumbler is flicked away, a coin on it falls into the glass. Which law explains this?

Question

When a card placed on a glass tumbler is flicked away, a coin on it falls into the glass. Which law explains this? — Exam MCQ

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B. Law of inertia — The coin tends to remain at rest as the card moves away. It then falls under gravity.

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A. Conservation of energy

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C. Newton's third law of motion

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D. Conservation of momentum