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hits an object of surface area of 
at right angles. When water hits the object, its speed drops to zero. With what force does the flow of the water current act on the object? Water density is 
.
and speed of 6 
falls on a wall and bounces off it at the same speed. The angle of incidence and the angle of reflection are 
with respect to the vertical. How much force does the wall exert on the gases?
. What is the thrust force on the aircraft?
. The mass flow rate of the water is 
.
of water per second, and the total weight of the board and the person on it is 130 kg. At what speed does water come out in the form of jets? The density of sea water is 
.
