The moon which is 380,000 km from the earth takes 28 days to orbit the earth in a circular orbit with constant speed v. What is the moon's tangential acceleration?
a) 8.6x10⁻³ m/s²; tangent to the orbital path
b) 2.6x10⁻³ m/s²; towards the earth
c) 6.4x10⁻³ m/s²; towards the earth
d) zero