Question

On the moon, the acceleration due to gravity is -1.6 meters per second per second. A stone is dropped from a cliff on the moon and hits hits the surface of the moon 20 seconds later. How far did it fall? What was its velocity at impact?

Answer 1

s = 1/2 at^2
v = at

plug in t=20, a = -1.6

Answer 2

45 is wrong