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

Physics
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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.
I mean r :)
So m doesn't matter in this problem, right?

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Other answers:

Since it's equal, it cancels each other.
ok, cool
Good luck :)
wouldn't vf =0?
What does vf stands for? final velocity?
yea
Lol, you're quite right. But the problem ask for v just the moment before collision. It isn't 0.
oh, gotcha

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