In principle, when you fire a rifle, the recoil should push you backward. How big a push will it give

The answer is " because it is in the opposite direction of the bullet".

Explanation:

Given:

Using formula:

It recoils the velocity of the rifle  

Its negative sign displays the opposite direction of the rifle.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

the assestment will probley apele with cause and effect