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A young girl threw a 1 Kg stone vertically upward into the air. Her hand moved through a distance of 0.5 m before the stone

A young girl threw a 1 Kg stone vertically upward into the air. Her hand moved through a distance of 0.5 m before the stone left her hand. If the stone reaches a maximum height of 20 m above her hand’s starting point, what force did she apply to the stone? Assume the force was constant and ignore air resistance.

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