Solve the following problem in which a radical must be evaluated. If air resistance is ignored, the speed of an object that is thrown straight down with an initial speed of 12 feet per second is given by s = 
, where s is its speed in feet per second and d is the distance in feet it has traveled. Find the speed of an object after it has traveled 15 feet. Find an approximation (rounded to the nearest whole number), and find the exact value (simplified radical).
A. 29 ft/sec; 4
ft/sec
B. 1 ft/sec; 4
ft/sec
C. 1 ft/sec; 4
ft/sec
D. 33 ft/sec; 4
ft/sec
Answer: D
Mathematics
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