Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo.
how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?
4/5 r
1/4 r
1/2 r
1/16 r

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Ibelieve your answer is b.hope this : )