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A small block of mass m is placed in a g...

A small block of mass `m` is placed in a groove carved inside a disc. The disc is placed on a smooth horizontal surface and pulled with acceleration of `20m//s^(2)`. If the coefficient of friction between walls of groove and block is `2/5`, the acceleration of block w.r.t disc is:

A

`4.24xx10^(5)J//kg`

B

`3.6xx10^(5)J//kg`

C

`3.84xx10^(5)J//kg`

D

None of these

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