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a 650kg satellite is to be placed into synchronus orbit around Earth.

What amount of work must be done onthe satellite to raise it into synchronous orbit?

i did..

W=GMm(1/r of Earth - 1/r of synchronous satellite)

= 6.673x10^-11N m^2/kg^2 (5.98x10^6kg)(650kg)(1/6.38x10^6m - 1/4.22x10^7m)

W = 3.442998737X10^10 J

the right answer is 3.7x10^10 J... is ther something wrong with the significant digits?? can anyone tell me the mistake that i did?