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Question

A boy of mass 40 kg is climbing a vertical pole at a constant speed. If the coefficient of friction between his palms and the pole is 0.8 and g=10 ms2, the horizontal force that he is applying on the pole is



A

300 N

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B

400 N

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C

500 N

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D

600 N

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Solution

The correct option is C

500 N


As the boy is climbing the pole at a constant speed (no acceleration), the force of friction must be just balanced by his weight, i.e.,
μR=mgR=mgμ=40×100.8=500 N.
Hence, the correct choice is (c).


Physics

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