Water ( = 1000 kg/m 3 ) is accelerated from rest in a horizontal pipe that is

Water (ρ = 1000 kg/m³) is accelerated from rest in a horizontal pipe that is 80 m long and 30 cm in diameter. If the acceleration rate (toward the downstream end) is 5 m/s², what is the pressure at the upstream end if the pressure at the downstream end is 90 kPa gage?