jwt:

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If a ball is thrown straight up into the air with an initial velocity of [math] ft/s, its height in feet after [math] second is given by [math]. Find the average velocity (include units, help (units)) for the time period begining when [math] seconds and lasting

(i) [math] seconds
Average velocity:

(ii) [math] seconds
Average velocity:

(iii) [math] seconds
Average velocity:

Finally based on the above results, guess what the instantaneous velocity of the ball is when [math].
Average velocity:

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