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Work and Kinetic Energy

An arrow, starting from rest, leaves the bow with a speed of 25.0 m/s. If the average force exreted on the arrow by the bow were doubled, all else remaining the same, with what speed would the arrow leave the bow?

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The kinetic energy of the arrow,

K = mv^2/2

(where "v^2" reads "v squared"), is equal to the work done on it by the string of the ...