A satellite is in a circular orbit about the earth (M_E = 5.98 × 10²4 kg). The period of the satellite is 1.42 × 10⁴ s. What is the speed at which the satellite travels?
a) 4.23 × 10³ m/s
b) 5.36 × 10³ m/s
c) 6.71 × 10³ m/s
d) 7.42 × 10³ m/s