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  4. A block A of mass 7 kg is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass 3 kg at the other end. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/e60bd9629195752c4129a57c4e17786d-.png /> The acceleration (in m/s2) of the system is (given g = 10 ms-2)

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Q. A block $A$ of mass $7\, kg$ is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass $3\, kg$ at the other end.
image
The acceleration (in m/s$^{2}$) of the system is (given $g = 10$ ms$^{-2}$)

Laws of Motion

Solution:

$a =\frac{m_{2}}{m_{1} +m_{2}} g = \frac{3}{7 +3}\times 10 =3$ m/s$^{2}$