Escape Velocity: Fun and Games Did you ever watch a group of children playing Red Rover? Arms linked up for strength, they chant, Red Rover, Red Rover, let Sally come over,and Sally s challenge is to break through that chain of linked arms. If she does it, Sally wins. Image to left: A Delta IV rocket launches at night. Credit: NASA If Sally breaks through the chain of arms, she s also demonstrated several key aspects to the space concept of escape velocity. Escape velocity (or a rousing game of Red Rover) requires an object to propel itself with…
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