[SOLVED] SAT Subject Test in Physics 1. The problem statement, all variables and given/known data Assume that every projectile fired from a toy cannon experiences force F along the length of the barrel. If a projectile of mass M leaves the barrel with speed, V, at what speed will a projectile of mass 2M leave the barrel with? 2. Relevant equations F=ma, a=(Vf-Vo)/t 3. The attempt at a solution The force F, produces acceleration of V/t for mass m, so the same force should produce F=(2m)(v/t), so the velocity equals v/2? This is a multiple choice question with choices A) v/2, B)v/sqrt(2), C)v, D)2v, E)4v The book says the answer is B, but gives no explanation.