You are watching: A boy is pulling his sister in a wagon as shown in the figure
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This is College Physics Answers via Shaun Dychko. The occupational done by this brother pulling his sister in the wagon is the component of pressure that he"s using that"s parallel to the displacement multiplied by that displacement. So the force is along this line 30 degrees over horizontal and that indicates the component that"s parallel to the displacement is gonna be this portion right here and also then we deserve to make a best triangle here and it"s the adjacent leg of this right triangle that we are interested in and also we deserve to find it by multiplying the hypotenuse by cosine of 30 and also so we relocation F parallel via F cos of Θ— Θ being this 30 levels here— and also then we multiply that by the displacement. So that"s 50 newloads times cos 30 times 30 meters which is 1.3 times 10 to the 3 joules.