A single force of F(x) = 24 - 6x^2 (in SI units) acts on a 7.2...

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A single force of F(x) = 24 - 6x^2 (in SI units) acts on a 7.2 kg mass. If at x=1 m the mass has a speed of 8 m/s then what is its speed at 4 m?

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