Question

initially the spring is undeformed. Now the force 'F is applied to as shown in the figure when
he displacement of 'B'wrt 'A' is 'X' towards right in some time then the relative action
B'w.rt. 'A' at that moment is

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Answer 1

Answer:

Initially the spring is undeformed. Now the force F is applied to B as shown. When the displacement of B w.r.t A is x towards right in some time then the relative acceleration of B w.r.t A at the moment is:

Explanation:A moment is  

m

F−2kx

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Answer 2

Answer:

F=2KX is the answer of this question