Physics third edition James S. Walker Chapter 20, problem 28 A charge of 3.05C i

Question

Physics third edition James S. Walker Chapter 20, problem 28 A charge of 3.05C is held fixed at the origin. A secondcharge of 3.056 is released from rest at the position(1.15m,0.550m). a). if the mass of the second charge is 2.66g, whatis its speed when it moves infinitely far from the origin? b). atwhat distance from the origin does the 3.05C charge attainhalf the speed it will have at infinity?
Thank you Chapter 20, problem 28 A charge of 3.05C is held fixed at the origin. A secondcharge of 3.056 is released from rest at the position(1.15m,0.550m). a). if the mass of the second charge is 2.66g, whatis its speed when it moves infinitely far from the origin? b). atwhat distance from the origin does the 3.05C charge attainhalf the speed it will have at infinity?
Thank you

Explanation / Answer

According to conservation of energy we have 0.5 mv2 = qV v = 2qV/m = (2kq2 /m*r)         =(2*8.85 x109 * (3.05x106)2/ 0.00266*(1.152+0.552) )         = 7.02 m/s

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