The height of a projectile fired upward with an initial velocity of 200 feet per second is given by the formula
?
?
where h is the height in feet and t is the time in seconds. Find the time required for the projectile to return to earth.
?
A. 20 sec
B. 45 sec
C. 35 sec
D. 15 sec
E. 30 sec
Answer: A
Mathematics
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?
?
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B. 
, 
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