A satellite of mass 2.0×104\,kg is in circular orbit at a distance of 2RE from Earth’s center, where RE is Earth’s radius. The local gravitational acceleration on the satellite is measured to be 2.5\,m/s2. Taking Earth’s mass as 6.0×1024\,kg, what is the magnitude of Earth’s simultaneous acceleration toward the satellite?
a) 3.3×10−20m/s2
b) 2.1×10−21m/s2
c) 8.3×10−21m/s2
d) 1.2×10−19m/s2