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1)A 380 kg piano slides 2.9 m down, at an angle of 25 °. A man pushes the piano from behind, parallel to the incline, and does not let it accelerate.Determine: (a) the force exerted by the man, (b) the work produced on the piano by the man, (c) the work produced on the piano by the force of gravity,and d) the total work produced on the piano. Ignore the friction.

Fig: 1

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