Answer
F = (0.0014 N) j
Work Step by Step
According to the customer, the coin is accelerating upwards at 2.4 $m/s^2$ or a = $2.4 m/s^2$ j. Since the coin has a mass of 0.567g or 0.000567kg, then to the customer,
F = (0.0014 N) j
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