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let the equation F(16) = -16t^2 + 128t +25 represent the height in feet of a...

let the equation F(16) = -16t^2 + 128t +25 represent the height in feet of a ball thrown vertically upward at time t seconds

a) find the instantaneous velocity of the ball at t = 2 seconds

b) find the impact velocity of the ball

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