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What is the minimum velocity of a projectile ( not a rocket) fired vertically from the...

What is the minimum velocity of a projectile ( not a rocket) fired vertically from the Earth so that it escapes from the Earth’s gravitational pull? This is known as its escape velocity. You can neglect air-resistance. HInt: If the velocity of the projectile falls to zero it will be pulled back to Earth.

(((include any assumptions)))

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