Answer to Question #918 in Mechanics | Relativity for rissel
W = (F*S)/t = F * V (v - speed);
As the force exerts at the angle to the horizont, we have to take its projectile:
F = F' cos (30) = 3 * 0.867 = 2.6
20 m/min = 20/60 = 0.33 m/sec.
W = 2.6 * 0.33 = 0.86 [W].
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