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Planet Alpha has a constant orbital speed of 20 km/s in a circular orbit around its star.

If it takes Planet Alpha 100 Earth days to complete half of an orbit, what is the magnitude of Planet Alpha's average acceleration during that time?

A

$4.6 \times 10^{-6}\space m/s^2$

B

$4.6 \times 10^{-3} \space m/s^2$

C

$2.3 \times 10^{-3} \space m/s^2$

D

$0.4 \space m/s^2$

E

$0 \space m/s^2$

F

$400 \space m/s^2$

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