1.

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 costant 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 verus its position `x` is shown in figure. What is the magnitude of `vec(F)` A. `2N`B. `4N`C. `8N`D. `16N`

Answer» Correct Answer - C
At equilibrium, F=kx &
`Fx-(1)/(2)kx^(2)=DeltaK.E.=4`
here x=1m {i.e. mean position}


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