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## Homework Statement

The space shuttle takes off from Cape Canaveral in Florida and orbits Earth 18 times before landing back at Cape Canaveral 23 hours and 7 minutes later. During this time, it moves in circular orbit with radius 6.6 x10^6 m.

## Homework Equations

The equation that I am using is Vave=(xfinal-x initial) /(tfinal-t inital)

## The Attempt at a Solution

I figured out the circumfrence which is 4.14*10^7 and then I multiplied that by 18 which gives me 7.46*10^8. I subtracted this and it gives me 7.05*10^8. I also converted 23.7 hours into 83220 seconds. I then took 7.05*10^8/83220 and got 8471.2m/s. According to to the book this is incorrect. Can someone tell me what I am doing wrong?

~Thanks