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revolution of the stars 6. A 2800-kg space vehicle, initially at rest, falls vertically from a height of 3300 km above the Earths surface. Determine how much work is done by the force of gravity in bringing the vehicle to the Earths surface. 7. The potential energy of a particle is given by U(x) = (9 ]/m4)x4-(8 J/m2)x2. At what value of x would the particle be in unstable equilibrium?
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