A 2.0 kg box rests on a plank that is inclined at an angle of 65° above the horizontal. The upper end of the box is attached to a spring with a force constant of 19 N/m, as shown in Figure 6-32. If the coefficient of static friction between the box and the plank is 0.21, what is the maximum amount the spring can be stretched and the box remain at rest?

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A 2.0 kg box rests on a plank that is inclined at an angle of 65° above the horizontal. The upper end of the box is attached to a spring with a force constant of 19 N/m, as shown in Figure 6-32. If the coefficient of static friction between the box and the plank is 0.21, what is the maximum amount the spring can be stretched and the box remain at rest?

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