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# Say g=10m/s^2 for convinece. On some massive planet the local "g" is 1/4 times greater than that on Earth.?

Say g=10m/s^2 for convinece. On some massive planet the local "g" is 1/4 times greater than that on Earth. From what height (in meters) above the surface of the planet should an astronaut release a stone (from rest) so that it takes 2 seconds to fall to the surface?

Update:

a)5

b)20

c)80

d)320

e) cannot determine with given information.

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