A student with a mass of 60 kg jumps straight up in the air by using her legs to apply an average force of 770. N to the ground for 0.25 s. Assume that the initial momentum of the student and the Earth are zero. What is the momentum of the student immediately after this impulse? What is the momentum of the Earth after this impulse? What is the speed of the Earth after the impulse? What fraction of the total kinetic energy that the student produces with her legs goes to the Earth (the mass of the Earth is 5.98 · 1024 kg)? Using conservation of energy, how high does the student jump?
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