physics repost

If Earth shrinks in size such that its shape and mass remain the same, but the radius decreases to 0.21 times its original value, find the acceleration due to gravity on its surface.

(6378.1/0.21)(9.80)
= 2.97 m/s^2

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1. No. The inverse law applies. If the distance shrinks, the force increases.

g= 9.8/(1/.21)^2

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2. not in the answer choices...

a-2.97 m/s^2
b-2.97 x 10^8 m/s^2
c- 220 m/s^2
d- 22x10^8 m/s^2

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