Two identical + 9.0 ? C point charges are initially 2.5 c m from each other. Par

Question

Two identical + 9.0?C point charges are initially 2.5cm from each other. Part A If they are released at the same instant from rest, how fast will each be moving when they are very far away from each other? Assume they have identical masses of 3.0mg . Express your answer using two significant figures. v =
  m/s Two identical + 9.0?C point charges are initially 2.5cm from each other. Two identical + 9.0?C point charges are initially 2.5cm from each other. Two identical + 9.0?C point charges are initially 2.5cm from each other. Part A If they are released at the same instant from rest, how fast will each be moving when they are very far away from each other? Assume they have identical masses of 3.0mg . Express your answer using two significant figures. v =
  m/s Part A If they are released at the same instant from rest, how fast will each be moving when they are very far away from each other? Assume they have identical masses of 3.0mg . Express your answer using two significant figures. v =
  m/s Part A If they are released at the same instant from rest, how fast will each be moving when they are very far away from each other? Assume they have identical masses of 3.0mg . Express your answer using two significant figures. v =
  m/s v =
  m/s

Explanation / Answer

By conservatin of energy

E_i =E_f

PE_initial =KE_final

KQ/r^2 =2(1/2)mV^2

=>V=sqrt[KQ^2/mr]

V=sqrt[9*10^9*(9*10^-6)^2/(3*10^-6)(2.5*10^-2)]

V=3117.6 m/s

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