I thought about this question.

Should I use its stationary point to calculate ?

A duck at position x = 0 ys to a pond 5 meters away atx = 5. Its height is given by the formula: 3 ' _x h(x) x 25 dx_ E_2' What is the duck's overall speed when it lands in the lake at x = 5? Give your answer to two decimal places as where x E [0, 5] is the horizontal position. Its horizontal airspeed is constant at I, :51? ' mlsec. dx 77 E @ dt Note: velocity is a vector and speed is the length of velocity