A10 kg gun recoils with a speed of 0.1 m/s after it fires a 0.001 kg bullet. what is the speed of the bullet?

As we know that here gun + bullet system is isolated from all other external force system

so here the momentum of system is always conserved

so we will say

here we know that

now we will have

by solving above equation we will have

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)