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 $\mathrm{ms}^{-2}$ is :
(Consider that the string is massless and unstretchable and the pulley is also massless and frictionless):
JEE MAIN 2024, Difficult
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$\mathrm{f}_{\mathrm{k}}=\mu \mathrm{N}=0.04 \times 20 \mathrm{~g}=8 \text { Newton }$
$\mathrm{a}=\frac{60-8}{26}=2 \mathrm{~m} / \mathrm{s}^2$
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