Question

23. The position of a runner is given by x 4.0t 0.50t, where x is in meters and t is in seconds. What is the average speed between0 andt 8.0 s? (Hint: Find the maximum value of x to determine each of the outward and backward distances.)
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Answer #1

x = 4t - 0.5t2

at t = 0

x = 0 m

at t = 8

x = 0 m

Therefore,

average speed = 0 m/s

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