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**1. Homework Statement**

A 1 500kg satellite is in orbit 250km above earth's surface. What minimum additional energy is needed to place this satellite in a new stable orbit 800km above earth's surface?

**2. Homework Equations**

W = delta Ep = -GMm(1/r

_{2}-1/r

_{1})

Ep = -GMm/r

Ek = GMm/2r or 1/2mv^2

**3. The Attempt at a Solution**

I tried using the work formula = -GMm (1/2r

_{2}-1/2r

_{1}, but I get the wrong answer. The answer is 3.41 x 10^9J. I thought to change the radius of orbit from one to another is the change in potential energy which is work?