# Physics

The cannon on a pirate ships shoots cannon balls with a speed of 350m/s (the muzzle velocity). The cannon can be adjusted to shoot at any elevation above the horizontal.

If the cannon’s barrel is 2m long and the force on the cannon ball is constant, what is the acceleration of the cannon ball in m/s2 inside the barrel?

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1. average velocity in the barrel is ... (0 + 350) / 2 = 175 m/s

time in the barrel is ... 2 m / 175 m/s

acceleration is ... 350 m/s / (time in barrel)

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