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 ms−2, the horizontal force that he is applying on the pole is

A

300 N

B

400 N

C

500 N

D

600 N

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=mg⇒R=mgμ=40×100.8=500 N. Hence, the correct choice is (c). Physics

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