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Q. A man stands on a scale in an elevator that has an upward acceleration a. The scale reads 940 N. When he picks up a 21.6 kg box, the scale reads 1237 N. Find: The mass of the man.The weight of the man. The acceleration a.

Q. The coefficients of static and kinetic frictions for plastic on wood are 0.50 and 0.40, respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

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