Hello
The answer is:
[tex]35000Kg.\frac{m}{s}=35000N[/tex]
Why?
Momentum is the quantity of movement of an object, and it's calculated using the mass and the velocity of the object. Momentum is expressed by the following formula:
[tex]p=m*v[/tex]
Where:
[tex]m=mass\\v=velocity[/tex]
So, calculating we have:
[tex]p=m*v=1400Kg*\frac{25m}{s}=35000Kg.\frac{m}{s}=35000N[/tex]
Remember,
[tex]1N=1Kg.\frac{m}{s}[/tex]
Have a nice day!
