I posit that a projectile requires constant propulsion to escape Earth's gravity. A friend maintains that a big enough "bang" at the Earth's surface can achieve the same result. Who is correct?
Md Ariful Islam
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,
এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
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Both of you are. Conservation of energy does not depend on the propulsion that got you to space. Remember that escape velocity refers to the velocity of an object at sea level. If an explosion sends an object flying away at that speed, it will escape Earth. In your case, constant propulsion generates a constant force which steadily increases velocity, and is another (the practical) way to achieve escape velocity.
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