physics homework?

Question

An object is released from rest on a planet that has no atmosphere. The object falls freely for 2.77 m in the first second.

What is the magnitude of the acceleration due to gravity on the planet?
Answer in units of m/s/s.

Answer 1

2.77m/s/s

In one second, the planet's gravity accelerated it from 0 m/s to 2.77 m/s. Ergo, the acceleration is 2.77m/s/s.

Answer 2

y = 1/2at^2

you have y = 2.77, t = 1 s so a = 2y/t^2 = 5.54m/(1s)^2 = 5.54 m/s^ = 5.54 m/s/s