I am having problems with part B of the following question. A human cannonball with a mass of 70 kg experiences an impulse of 4000 N/s for 0.35 s a) Calculate the force acting on the human cannonball. This is my sol'n: J = 4000 N/s (delta)t = 0.35 s J = F(delta)t 4000 N/s = F(0.35 s) F = (4000 N/s) / (0.35 s) F = 11429 N b) How long was the barrel of the cannon? (Assume the force is applied only for a period of time that the cannonball is in the cannon.) For part B I think I just need clarification on what the question is saying. Is it saying to change the time or the force ????