What is the acceleration of the block and trolley system shown in if the coefficient of kinetic friction between the trolley and the surface is 0 .04 ? What is the tension in the string ? Take `g = 10 ms^(-2)` Neglect the mass of the string
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Explanation

`a_("system")=(30-f_(k))/(23)=(30-0.04xx20xx10)/(23)=(22)/(23)=0.956`
Equation of motion for 3kg block
`3g-T=3arArrT=3g-3a`
`rArrT=3(!0)-3(0.956)=30.0-2.868=27.13N`