Physics Help?

Question

An object is released from rest on a planet
that has no atmosphere. The object falls
freely for 4.7 m in the first second.
What is the magnitude of the acceleration
due to gravity on the planet? Answer in units
of m/s2.

Answer 1

h=0.5 g t^2
g=2 h/t^2
g=2 (4.7) / (1) ^2
g= 9.4 m/s^2