Questions

A block of mass 10 Kg pushed by a force F on a horizontal rough plane moves with an acceleration 5 m/s². When the force is doubled, the acceleration becomes 18 m/s², the coefficient of friction is (g = 10 m/s²)

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detailed solution

Correct option is A

F−μmg=maFor the first case F−μmg=5m→(1)For the second case 2F−μmg=18m→(2)Solving the two equation : μ=0.8.

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