Initially the spring is undeformed. Now the force F is applied to B as shown in the figure. When the displacement of B w.r.t. A is x towards right in some time then therelative acceleration of B w.r.t. A at that moment is
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a
F2m
b
F−kxm
c
F−2kxm
d
none of these
answer is C.
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Detailed Solution
F−kx=mb and kx=ma Hence m(b−a)=F−2kx or b−a=F−2kxm