During the performance of the Bouglione circus in 1976, John Tailor was fired from a compressed-air cannon whose barrel was 20m long. Taylor emerged from the cannon at 40 m/s. If Tailor's mass was 70kg, find the force on him during the firing of the cannon. I'm at a loss for what to do. I understand that in order to get the force I must get the acceleration first. What's the relevance of the length of the barrel to the computations? How should I proceed? Thank you! ^__^.