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help please! A projectile is fired vertically upward into the air; its position (in feet) above the ground after t seconds is given by the

help please!

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A projectile is fired vertically upward into the air; its position (in feet) above the ground after t seconds is given by the function s(t) shown below. Use limits to determine the instantaneous velocity of the projectile at t = a seconds for the given value of a. s(t) = - 161 + 60t; a = 1 The instantaneous velocity at ( = 1 is it/ s. 11/s. LG More

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