Electro

force on shell and charge is same
first charge and shell will cover distance R/2 then charge is just inside shell , potential inside shell is 0 , acc is 0 they both travel with const Velocity for R distance , R by charge , R by shell
Distance travelled by Charge = R + R/2 = 3R/2 this is the answer and const velocity for R distance , this also the answer but

Pt of charge at start = KqQ/R and it wont just decrease linearly since shell is also moving , how will we find speed?
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