A partical of mass m oscillates along t...

A partical of mass `m` oscillates along the horizontal diameter `AB` inside a smooth spherical `AB` inside a smooth sperical shell of radius `R`. At any instate `K.E.` of the partical is `K`. Then force applied by partical on the on the shell at this instant is:

`K/R`

`(2K)/R`

`(3K)/R`

`K/(2R)`

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