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A block of mass m lies on a horizontal f...

A block of mass `m` lies on a horizontal frictionless surface and is attached to one end of a horizontal spring (with spring constant `k`) whose other end is fixed . The block is intinally at rest at the position where the spring is unstretched `(x=0)`. When a constant horizontal force `vec(F)` in the positive direction of the `x-`axis is applied to it, a plot of the resulting kinetic energy of the block versus its position `x` is shown in figure. What is the magnitude of `vec(F)` ?

A

2N

B

4N

C

8N

D

16N

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A
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