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A ladder 10-m long and weighing 50 N rests against a smooth vertical wall. If the ladder is just on the verge of slipping when
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for the practice test unit 2 lesson 12 1. 9778 or C 2. 64288 or A 3. 1130 or C 4. 1017 or A 5. 105 or B 6. 100 or B 100%
