Question: When a projectile is fired vertically upward from the ground at an initial velocity of 80 ft/sec, its height h (in feet) after t seconds

When a projectile is fired vertically upward from the ground at an initial velocity of 80 ft/sec, its height h (in feet) after t seconds is given by h(t)= 80t-16t^2

find the average height of the projectile during its 5 seconds flight

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