A box with mass of 8 kg is released from rest on a surface that exerts friction on the box. The block moves a distance of 1.6-m down the incline, in a time interval of 0.80 s and acquires a velocity of 4.0 m/s. How much work does gravity do on the block? a.+81 J b.+120 J c.-100 J d.-81 J e.+100 J

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