A block of mass M is placed on a smooth ...

A block of mass M is placed on a smooth horizontal surface and it is pulled by a light spring as shown in the diagram. If the ends A and B of the spring are moving with 4 `ms^(-1)` and 2 `ms^(-1)` respectively and the rate at which spring energy is increasing is 20 `Js^(-1)`. then what is the value of spring force (in N)?

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