Question:
Two masses $A$ and $B$, each of mass $M$ are fixed together by a massless spring. A force acts on the mass $\mathrm{B}$ as shown in figure. If the mass A starts moving away from mass B with acceleration 'a', then the acceleration of mass B wil be :-
Correct Option: , 4
Solution:
$a_{c m}=\frac{m_{1} a_{1}+m_{2} a_{2}}{m_{1}+m_{2}}$
$\frac{F}{2 M}=\frac{M a+M a_{B}}{2 M}$
$a_{B}=\frac{F-M a}{M}$
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