A crowbar 1.5 m long is supported underneath 1.2 m from the end by a rock, with the other end under a boulder. If the crowbar is at an angle of 18° with the horizontal and a person pushes down, perpendicular to the crowbar, with a force of 240 N, what vertical force is applied to the boulder? See Fig. 9.46 (The forces are related by 1.2F₁ = 0.3F₂.)

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Fig. 9.46 L F₁ = 240 N 18° -1.5m F₂