Question

A box of mass 20 kg is kept at rest on a horizontal floor. When it is pushed by a horizontal force F, it moves with a constant velocity. If it is pushed by a horizontal force of 2F, it moves with an acceleration of 2 m/s2. The value of F is

Answer 1

We know:

ma=F−μmg

Case 1:

5×10=F−100μ

Case 2:

18×10=2F−100μ

Solving simultaneously we get:

F=130N, μ=0.8

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