You need to know the magnitude of the pulling force. If mass and coef of friction are given and the velocity is constant then it is
horizontal force = F cos 30 = m g (mu-sin 30)
W = F cos 30 * 20*10^3 J
a horse pull a barge with a force at an angle of 30¡ã to the horizontal for a distance of 20km . find the work done.
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