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Q. During an Apollo lunar landing mission, the command module continued to orbit the Moon at an altitude of about 100 km. Explain how much time did it take to go around the Moon once? Give your answer in seconds, do not enter units.

Q. After falling from rest from a height of 35 m, a 0.45 kg ball rebounds upward, reaching a height of 25 m. If the contact between ball and ground lasted 1.8 ms, what average force was exerted on the ball?

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