If an average-sized man falls with a parachute, then his velocity 
, in feet per second, t seconds into the fall is given by
.
?
During which period will his velocity be between 9.99 and 12.99 feet per second? Round to two decimal places.
A. From 0.65 seconds on
B. From 9.77 seconds on
C. From 0.43 to 0.65 seconds into the fall
D. From 4.88 to 9.77 seconds into the fall
Answer: C
Mathematics
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B.
| T | T | T |
F T T
F F T
C.
| T | T | T |
F T T
F F F
D.
| T | T | T |
F T T
F F F
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A. 
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D. 
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