Water from a tap emerges vertically downwards with an initial speed of \( 1.0 \, \text{ms}^{-1} \). The cross-sectional area of the tap is \( 1 \, \text{cm}^2 \). Assume that the pressure is constant throughout the stream of water and that the flow is steady. The cross-sectional area of the stream \( 15 \, \text{cm} \) below the tap is \( (g = 10 \, \text{ms}^{-2}) \)