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In the diagram shown, the blocks A, B an...

In the diagram shown, the blocks A, B and C weight, 3kg, 4kg and 5kg respectively. The coefficient of sliding friction between any two surface is 0.25. A is held at rest by a massless rigid rod fixed to the wall while B and C are connected by a light flexible cord passing around a frictionless pulley. Find the force F necessary to drag C along the horizontal surface to the left at constant speed. Assume that the arrangement shown in the diagram, B on C and A on B, is maintained all through. `(g=9.8m//s^2)`

A

75

B

80

C

85

D

None of these

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The correct Answer is:
B
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MOTION-NLM & FRICTION-EXERCIS-1
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  13. There block A B ,and C of equal mass m are placed one over the other o...

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  15. In the figure ( g = 10 m//s^(2) ) .Acceleration of 2kg block is :

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  16. A block placed on a rough inclined plane of inclination ( theta= 30^(@...

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  18. A block of mass 15 kg is resting on a rough inclined plane as shown in...

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