Recent content by jpcyiu

A gun of mass M fires a shell of mass m and recoils horizontally. If the shell travels with speed v relative to the barrel, find the speed with which the barrel begins to recoil if (a) the barrel is horizontal (b) the barrel is inclined at an angle A to the horizontal.

hello everyone! I want to know how to verify cos sin tan I always feel confused when i am doing the physics exercises. are we always use cos when it is x-axis and use sin when it is y-axis?? I feel so confused.