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If it takes a human cannonball 1.5s to exit a 1.6m long cannon, what is the average net force acting on the perfomrer if his mass is 65kg? The answer for this is 92N. I don't understand why. A supertanker of mass 1.0 x 10^8 kg travels 3.5km, reaching a speed of 4.1km/h from rest. What was...