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Chaso
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Homework Statement
Comets move around the sun in very elliptical orbits. At its closet approach, in 1986, Comet Halley was 8.79 x 10^7 km from the sun and moving with a speed of 54.6 km/s.
What was the comet's speed when it crossed Neptune's orbit in 2006?
Homework Equations
Mv1r1=Mv2r2
The Attempt at a Solution
What I did was use the equation above, and solve for v2. But it says I'm wrong. Any Suggestions?
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