A 10-M Plank with a Mass of 80 Kg Is

question 19

Multiple Choice

A 10-m plank with a mass of 80 kg is being moved by rolling it over two cylindrical logs, each with a mass of 10 kg and a radius of 20 cm, placed 2 m from either end of the plank. As the plank is pushed, the logs roll on the ground without slipping, and the plank does not slip on the rollers. A force of 250 N is applied to the plank. What is the speed of the plank after it has moved 2 m, starting from rest?

• A) 1.87 m/s
• B) 2.53 m/s
• C) 3.43 m/s
• D) 3.54 m/s
• E) 2.37 m/s

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