A block of mass \( 40 \mathrm{~kg} \) slides over a surface, when a mass of \( 4 \mathrm{~kg} \)...

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A block of mass \( 40 \mathrm{~kg} \) slides over a surface, when a mass of \( 4 \mathrm{~kg} \) is suspended through an inextensible massless string passing over frictionless pulley as shown below. The coefficient of kinetic friction between the surface and block is 0.02 . The acceleration of block is. (Given \( g=10 \mathrm{~ms}^{-2} \).)
(a) \( 1 \mathrm{~ms}^{-2} \)
(b) \( 1 / 5 \mathrm{~ms}^{-2} \)
(c) \( 4 / 5 \mathrm{~ms}^{-2} \)
(d) \( 8 / 11 \mathrm{~ms}^{-2} \)
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