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A truck of mass 9212 kg moving at a speed of 73.2 mph has lost its brakes. Fortunately, the driver finds a runaway lane, a gravel-covered incline that uses friction to stop a truck in such a situation; see the figure. In this case, the incline makes an angle of θ = 39.65° with the horizontal, and the gravel has a coefficient of friction of 0.634 with the tires of the truck. How far along the incline (∆x) does the truck travel before it stops?

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