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A block of mass 0.9 kg attached to a spr...

A block of mass `0.9 kg` attached to a spring of force constant `k` is lying on a frictionless floor. The spring is compressed to `sqrt(2) cm` and the block is at a distance `1//sqrt(2) cm` from the wall as shown in the figure. When the block is released, it makes elastic collision with the wall and its period of motion is `0.2 sec`. Find the approximate value of `k`

A

`100 Nm^(-1)`

B

`10 Nm^(-1)`

C

`0.1 Nm^(-1)`

D

`1 Nm^(-1)`

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The correct Answer is:
A
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