1. The problem statement, all variables and given/known data An object of mass m is launched at speed v from point P on horizontal ground at an angle of elevation of 45 degrees, as shown in the picture. When the object reaches point Q the magnitude of the change in momentum of the object is ? 2. Relevant equations Change in momentum of the object mv - mu 3. The attempt at a solution Honestly, I really don't know how to start All i know is use the formula of the change of momentum But then the angle 45 degrees I really dont know where to put.. Can somebody help me Sorry for not attempting Is because I am a bit blur.. Lastly the options for this question is A : Zero B : 1/2 mv C : 2mv D : 4mv Thanks so much..