<PRE><B>Question 1145938</B>
Since the height of the building is given in feet, we will use 32 feet per second squared as the acceleration of gravity
:
distance(s) = 0.5 * at^2, where a is acceleration of gravity and t is the time it takes for the hammer to hit the ground
:
0.5 * 32 * t^2 = 300
:
t^2 = 300/16 = 18.75
:
t = 4.33 seconds
:
(a) average velocity(v) = a/t = 32/4.33 =  7.39 feet/sec
:
(b) instantaneous velocity = at = 32 * 4.33 = 138.56 feet/sec
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