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# Velocity of two masses under their own gravitational influence watch

1. Two rigid objects in outer space, with masses 5.0 kg and 8.0 kg are observed from an inertial reference frame to be released at rest at a very large seperation. Assuming that only the mutual gravitational attraction is important, determine the speed of each object when the centre of masses of the two object is seperated by 3.0 m.

The answers are 1.48*10^-5 and 9.24*10^-6 m/s.

Can someone help me with this please, I know it's a question involving conservation of energy but I don't know where to start...
2. bump
3. Also need conservation of momentum
4. (Original post by KeyFingot)
Two rigid objects in outer space, with masses 5.0 kg and 8.0 kg are observed from an inertial reference frame to be released at rest at a very large seperation. Assuming that only the mutual gravitational attraction is important, determine the speed of each object when the centre of masses of the two object is seperated by 3.0 m.

The answers are 1.48*10^-5 and 9.24*10^-6 m/s.

Can someone help me with this please, I know it's a question involving conservation of energy but I don't know where to start...
Try conservation of momentum and conservation of energy together
remember

and
5. Thanks guys

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Updated: January 5, 2013
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