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Please help, unsure how to start this.

Please help, unsure how to start this.

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Answer #1

using conservation of energy

total KE at infinity = max potential energy at approach

2* (0.5* m v^2) = k q^2 / r

1.67*10^-27* (1.5*10^3)^2 = 9*10^9* (1.6*10^-19)^2 / r

r = 6.13*10^-8 m

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Comment in case any doubt, will reply for sure.. Goodluck

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