Question

Two blocks are resting on ground with masses $5kg$ and $7kg$. A string connected them which goes over a massless pulley A . There is no friction between pulley an d string A. force $F=124N$ is applied on pulley A.Find acceleration of centre of mass of the system of two masses (in $m/s^2$)

Answer 1

Given,

$mass{m}_1=5kg,m_2=7kg.f=124N$

Since the net force in the system is:

$F_{net}=124-(7+5)10=124-120=4N$

So the acceleration of the center of the mass is $a_{cm}=\frac{4}{12}=0.33m/s^2$

Thus this is the acceleration of the center of the mass.