The figure showns a mass m on frictionle...

The figure showns a mass m on frictionless surface It is connected to righd 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 actiing on the block towareds right, then the speed of the block when the defromation 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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