Impulse is a measure of the change in momentum of an object, and is equal to the force applied to the object multiplied by the time interval over which the force is applied.
To calculate impulse, you need to know the force applied to an object and the time interval over which the force is applied. The formula for impulse is: Impulse = Force x Time
The angle of velocity does not have a direct effect on impulse. However, it can affect the direction of the object's momentum, which in turn can affect the overall impulse.
Yes, you can use trigonometry to calculate impulse when velocity is angled. You will need to use the angle of the velocity and the force vector components in the calculation.
Impulse is measured in Newton-seconds (N*s) or kilogram-meters per second (kg*m/s).