2. g is a vector g from planet g from star Total g = Vector sum Star planet
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6. Gravitational Potential Energy planet 1 kg Attracted by gravity Negative PE Back to zero energy 2kg The potential at a point is the energy needed to move 1 kg from infinity to that point The potential energy of an object is the energy needed to move the object from infinity to that point PE = mV = -GMm/r V = -GMm/r Amount of work needed to remove 1kg Zero energy Amount of work needed to remove 2 kg
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