Consider a block and trolley system as shown in figure. If the coefficient of kinetic friction between the trolley and the surface is $0.04$ , the acceleration of the system in $m s^{- 2}$ is: (Consider that the string is massless and unstretchable and the pulley is also massless and frictionless) :

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Maximum kinetic friction acting, f k = μ N = 0 .04 × 20 g = 8 Newton Therefore, acceleration of the system will be a = 60 − 8 26 = 2 m s - 2

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