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The position s of a point (in feet) is given as a function of time t...

The position s of a point (in feet) is given as a function of time t (in seconds). HINT [See Example 1.] s = t + 2t2; t = 9

(a) Find the point's acceleration as a function of t. s''(t) = ___? ft/sec2

(b) Find the point's acceleration at the specified time. s''(9) = ___? ft/sec2

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