<PRE><B>Question 287363</B>
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
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