find normal force

i think it is b

in the last line distance between A=B is r√2

what is that =

is that why ur posting:P

i think im misinterpreting something

how can AB be lesser than 2r

it is given to be √2r

Ans is a)
But I don't have the solution.

N₁+m(v/√2)²/R=mg/√2

N₁=mg/√2-mv²/2R ...(Ans)

(a)

v/√2 kaise aai

Work done by normal reaction N2 is zero for moving block and sphere(as N2 is internal force for them)

N₂v/√2-Nv'=0
v'=v/√2