How much work must be done to push a 950 kg box 800metersup a 10 degree incline

Question

How much work must be done to push a 950 kg box 800metersup a 10 degree incline at a constant speed? a) assumefriction is negligible; b) assume the coefficeint of frictionis 0.20 My notes say W = mg sin theta times distance; g - mgh; N + mgtimes h; F = mu N fr Please give both answers; it is due this morning by 7:30 and Idid not know it was 800 meters until last night. How much work must be done to push a 950 kg box 800metersup a 10 degree incline at a constant speed? a) assumefriction is negligible; b) assume the coefficeint of frictionis 0.20 My notes say W = mg sin theta times distance; g - mgh; N + mgtimes h; F = mu N fr Please give both answers; it is due this morning by 7:30 and Idid not know it was 800 meters until last night.

Explanation / Answer

in first case f1 = mghsin                     = 1294.65 kJ in second case = f2 = mghsin +umgh                            = 2785.77 KJ

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