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20.) A 2.2 kg block starts from rest on a rough inclined plane that makes an angle of 25° with the horizontal. The coefficient of kinetic friction is 0.25. As the block goes 2.0 m down the plane, the mechanical energyof the Earth-block system changes by(1) Zero(2) -9.8 J(3) 9.8 J(4) -18 J(5) 18 Jis​

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