A block of mass is pulled along a rough horizontal surface by a horizontal force of . The coefficient of friction is . Find the acceleration. (Take .)
Answer and explanation
Correct answer: B.
- Step 1: Friction (limiting, since the block moves) N.
- Step 2: : , so m s.
Answer
.
Why not the others: is what you get if you ignore friction. is what you get if you add friction to the pulling force. is what you get if you divide by .
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