help//// on pressure.... ! 1. The problem statement, all variables and given/known dataWhat gauge pressure in the water mains is necessary if a firehose is to spray water to a height of 20 ? 2. Relevant equations Pressure = density * gravity * chanfe of height 3. The attempt at a solution density of the water is 100 kg/m^3 so will the solution be: 100 (kg.^3) * 9.8 (m/s^2)* 20m =19600 pa????