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A singe force of F(x) = 15 -3x^2 acts on an 4kg object as it moves...

A singe force of F(x) = 15 -3x^2 acts on an 4kg object as it moves from x =1m to x=4m. If the object has a speed of 5m/s at 1m, then what is its speed at 4m?

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