Water (Density = 1

Multiple Choice

Water (density = 1.0 x10³ kg/m³) flows downhill through a pipe of diameter 1.5 cm.Its speed at the top of the hill is 7.2 m/s.If the hill is 9.5 m high, what is the gravitational potential energy density of the water at the top of the hill relative to the bottom?

A) cannot be calculated without knowing the pressure
B) 120 J/m³
C) 7.2 x 10³ J/m³
D) 9.5 x 10³ J/m³
E) 9.3 x 10⁴ J/m³