The height of a certain projectile is related to time by y = -5(t - 5) 2

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The height of a certain projectile is related to time by y = -5(t - 5)2 + 125, where y is in meters and t is in seconds. 

(a) Sketch y versus t for 0 ≤ t ≤ 10 s. 

(b) Find the average velocity for each of the 1-s time intervals between integral time values from 0 ≤ t ≤ 10 s. Sketch vav versus t. 

(c) Find the instantaneous velocity as a function of time.

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