Question

An antitank weapons fires a 3.5 rocket, which acquires a speed of 70 m/s after traveling 90cm down a launching tube. Find the net force during lonch?
I guess maybe you mean 3.5 kg ???

Force = change in momentum / change in time

average speed = (70+0)/2 = 35 m/s
so
time = .90 /35 = .0257 seconds

F = 3.5 * 70 / .0257

= 9528 N

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