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 $\mathrm { m } \mathrm { s } ^ { - 2 }$ is: (Consider that the string is massless and unstretchable and the pulley is also massless and frictionless):\\
(1) 3\\
(2) 4\\
(3) 2\\
(4) 1.2