A water monitor on a fireboat ejects a continuous stream of water. The water, initially at rest relative to the vessel, is accelerated and leaves the nozzle at a speed of 35 m s-1. The average reaction force acting on the monitor due to this acceleration is 14 kN14\text{ kN}14 kN.
What mass of water is discharged by the monitor in 45 s?
4.0×102 kg4.0 \times 10^2\text{ kg}4.0×102 kg
1.8×104 kg1.8 \times 10^4\text{ kg}1.8×104 kg
8.9 kg8.9\text{ kg}8.9 kg
3.0×102 kg3.0 \times 10^2\text{ kg}3.0×102 kg
