Homework Help: physics

Posted by michelle on Thursday, September 13, 2012 at 9:09pm.

An object is released from rest on a planet that has no atmosphere. The object falls freely for 5.02 m in the ﬁrst second. What is the magnitude of the acceleration due to gravity on the planet?
Answer in units of m/s

can someone help me please? i tried doing this
-5.02m =Xa
-5.02m =Vo*(t) + (1/2)*a(t^2)
-5.02m =(1/2)*a
-10.04m/s^2 = a

but its says that its wrong. can someone please help?

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