Q.

Consider a block and trolley system as shown in the figure. If the coefficient of kinetic friction between the trolley and the surface is 0.04, the acceleration of the system in ms-2 is ______.

(Consider that the string is massless and unstretchable and the pulley is also massless and frictionless.)           [2024]

1 3  
2 4  
3 2  
4 1.2  

Ans.

(3)

fk=μN=0.04×20g=8 Newton

Acceleration a=60-826=2 m/s2