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What force must a high jumper of mass 80kg exert on the ground to produce an upwards acceleration 2.5 times of the acceleration due to

What force must a high jumper of mass 80kg exert on the ground to produce an upwards acceleration 2.5 times of the acceleration due to gravity? Treat the effect of air resistance to be negligible. Treat the upward direction as positive and include units as appropriate

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