In Jule Verne's 1865 story with this title, three men went to the moon in a shell fired from a giant canon. (a) Find the minimum muzzle speed needed to shoot a shell straight up to a height above the earth equal to the earth's radius R. (b) Find the minimum muzzle speed that would allow a shell to escape from the earth completely. (a) 2 Projectile, mass m r₂ = 2RE 1 r₁= RE Earth, mass me (b) 2 Projectile, mass m r₂ = 0 < 1 r₁= RE Earth, mass me

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