Question 138 of 210

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) :

A$3$B$4$C$2$D$1.2$

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Answer: (C) $2$

Maximum kinetic friction acting, ${f}_{k}=\mu N=0.04\times 20g=8$ Newton
Therefore, acceleration of the system will be$a=\dfrac{60-8}{26}=2m{s}^{-2}$