A 10kg object is released from rest 500km approx 300 miles, Ask an Expert

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A 1.0kg object is released from rest 500km ( approx 300 miles) above the earth.

a. What is its impact speed as it hits the ground? Ignore air resistance.

b. What would the impact speed be if the earth were flat?

c. By what percentage is the flat-earth calculation in error?

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