The figure shown a mass m on frictionles...

The figure shown a mass m on frictionless surface It is connected to rigid wall by the mean of a massless spring of its constant K. Initially , The spring at its natural position. If a force of constant magnitude starts acting on the block towards right, then the speed of the block when the deformation in spring is x, will be

`sqrt(2F_(x)-Kx^(2))/(m)`

`sqrt(F_(x)-Kx^(2))/(m)`

`sqrt(x(F-K))/m`

`sqrt(F_(x)-Kx^(2))/(2m)`

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