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## Homework Statement

Jules Verne [/B]In his novel

*From the Earth to the Moon*(1866), Jules Verne describes a spaceship that is blasted out of a cannon, called the

*Columbiad*, with a speed of 12,000 yards/s. The

*Columbiad*is 900 ft long, but part of it is packed with powder, so the spaceship accelerates over a distance of only 700 ft. Estimate the acceleration experienced by the occupants of the spaceship during launch.

v

_{0}= 10,975.60976 m/s

a = ?

d = 213.4146341 m

## Homework Equations

[/B]

1) [itex]x= x_0+v_0t+\frac{1}{2}at^2[/itex]

2) [itex]v^2 = v_o^2 + 2a\Delta x[/itex]

## The Attempt at a Solution

I tried solving the second equation, but I got an insane number that isn't plausible. My main problem is what should I consider V

_{0}, is it 0 or is it the 10,975 m/s? If I set it to 0, then i'm only calculating the acceleration from at rest to as soon as it leaves the cannon's barrel. Otherwise, if I set it to the 10,975 m/s, then I don't know the final velocity after accelerating for 213.4 m. Also, would the acceleration be considered as [itex]-9.8\frac{m}{s^2}[/itex]?

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