SOLUTION: 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 the surface of the moon 20 seconds later.

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Question 287363: 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 the surface of the moon 20 seconds later.
a)How far did it fall?

b)What was its velocity at impact?
Answer by Alan3354(69443) About Me  (Show Source):
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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 the surface of the moon 20 seconds later.
a)How far did it fall?
s = (1/2)at^2
s = 1.6*400/2
s = 320 meters
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b)What was its velocity at impact?
v = at
v = 1.6*20 = 32 meters/sec