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October 26, 2014

Homework Help: physics

Posted by Rachel on Friday, March 11, 2011 at 10:32pm.

Two hypothetical planets of masses m1 and m2 and radii r1 and r2, respectively, are nearly at rest when they are an infinite distance apart. Because of their gravitational attraction, they head toward each other on a collision course. Note: Both the energy and momentum of the isolated two planet system are constant.

(b) Find the kinetic energy of each planet just before they collide, taking m1 = 1.80* 10^24 kg, m2 = 9.00* 10^24 kg, r1 = 3.40* 10^6 m, and r2 = 5.20* 10^6 m.

please could you help me get kinetic energy
k1 = ?
k2 = ?

please thank you

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