Quote:
Originally Posted by robc
Sort of, in a closed system yes, kinetic energy is all that matters mass * velocity = X no matter whether it takes 5 seconds to go from v1 to v2 or 10 seconds.
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To be clear Ek = 1/2 m x v^2, even dropping the 1/2 is OK in some engineering calculations or scaling arguments but m x v is momentum not energy.