Water from a fire hose is directed horizontally against a wall at a rate of 41.0 kg/s and a speed of 18.4 m/s. calculate the magnitude of the force exerted on the wall, assuming the water’s horizontal momentum is reduced to zero.

754.4 N

Explanation:

Follow the units. Force = (mass[kg])•(acceleration[m/s²])

*The bit about horizontal momentum going to 0 is likely just to rule out the fact that the full force of the water might not be exerted in all situations.*

So (18.4 m/s)•(41.0 kg/s) = 754.4 N of force.