A horizontal pipe line carries water in a streamline flow. At a point along the pipe where the cross-sectional area is 10 `cm^2` ,the water velocity is 1m/ s and the pressure is 2000 Pa. What is the pressure of water at another point where the cross-sectional area is 5 `cm^2` ?
| A. |
2000 Pa |
| B. |
1000 Pa |
| C. |
500 Pa |
 |
| D. |
100 Pa |