SOLUTION: A ball is projected upward from the ground. Its distance in feet from the ground in t seconds is given by s(t)= -16t + 208t. At what times will the rocket be 550 feet from the grou

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Question 48251: A ball is projected upward from the ground. Its distance in feet from the ground in t seconds is given by s(t)= -16t + 208t. At what times will the rocket be 550 feet from the ground?
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
s(t)= -16t + 208t
550= -16t + 208t [Set the problem equal to 550 feet]
550= 192t [Combine like-terms]
550/192 = 192t/192 [Solve for "t"]
2.8645 = time
.
Check by plugging (2.8645 = t) back into the original equation]
s(2.8645)= -16(2.8645) + 208(2.8645)
s(2.8645)= 549.984 = 550 [Checks out]