Supose the water flows out from a pipe at 3 kg/s & its velocity changs from 5 to 0 on striking wall then the force exrted by water on wall wil be?

Answer 1

The force equals the rate of momentum change, which equals

(mass flow rate)x(velocity change)

The answer will be in Newtons.

You should have provided units (presumably m/s) with your velocity numbers.

Answer 2

15N

Answer 3

15N

Answer 4

Since the mass flow rate is 3 kg/s and the velocity changes from 5 to 0 m/s, the force exerted by the water on the wall can be calculated as:

Force = (mass flow rate) x (velocity change)
Force = 3 kg/s x 5 m/s
Force = 15 N

So the force exerted by the water on the wall is 15 Newtons.