Two oppositely charged particles are released from a distance L away from each other, at what time t will they meet? Use conservation Laws. Any help, greatly appreciated.

Question

anonymous · Answer

Coulomb's Laws

anonymous · Answer

what's their masses ?

anonymous · Answer

mass of electron = 9.1e-31kg, and proton = 1.673e-31kg

anonymous · Answer

so they are the electron and proton? note that when they collide, their potential energies are zero.
 you can use the following formula
$\Sigma W=E_k$ , since u=0
$\frac{1}{2} mv^2= \int_0^R -\frac{kQ_1Q_2}{r^2} dr$ for this. 
and also the linear momentum velcity eq, $v_1=\frac{m_1-m_2}{m_1+m_2} u_1 +\frac{2m_2}{m_1+m_2} u_2$ for this.

anonymous · Answer

sorry, the last one won't work. You'll have to use $m_1 v_1 = -m_2 v_2$ by conservation of momentum

anonymous · Answer

The mass of the proton provided above is incorrect. M proton =1.672xE-27 Kg