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At a given instant in time, a rock is observed to be falling with an acceleration of 5.8 m/s2 downwards. The magnitude of the force

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At a given instant in time, a rock is observed to be falling with an acceleration of 5.8 m/s2 downwards. The magnitude of the force of air resistance acting upon the rock at this instant is 20 N. What is the mass of the rock? :3\" 5 kg 10 kg 15 kg 20 Kg

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