Posted by **vv** on Tuesday, September 17, 2013 at 9:03am.

Earth speeds along at 29.8 km/s in its orbit. Neptune's nearly circular orbit has a radius of 4.5 x 109 km, and the planet takes 164.8 years to make one trip around the Sun. Calculate the speed at which Neptune plods along in its orbit.

- Physics -
**bobpursley**, Tuesday, September 17, 2013 at 10:34am
speed=distance/time=2PI*radius/164.8 years

now, convert years to seconds and you have it.

- Physics -
**vv**, Tuesday, September 17, 2013 at 11:49am
yes i solve it like this but we will not need the speed of the earth ?

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