spndsh
Two Juptier sized planets are released from rest 1.0 x 10^11 m apart. What are their speeds as they crash into each?



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imron07
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The mechanical energy is conserved.
1/2 mv^2+Gm/r=constant
From here we can find v and x as well.

imron07
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I mean r :)

spndsh
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So m doesn't matter in this problem, right?

imron07
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Since it's equal, it cancels each other.

spndsh
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ok, cool

imron07
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Good luck :)

spndsh
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wouldn't vf =0?

imron07
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What does vf stands for? final velocity?

spndsh
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yea

imron07
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Lol, you're quite right. But the problem ask for v just the moment before collision. It isn't 0.

spndsh
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oh, gotcha