In coming to a stop, a car leaves skid marks 65m long on a highway. assuming a deceleration of 4m/s^2,estimate the speed of the car just before breaking?

By definition, we have that the final speed is given by:

Where,

vo: initial speed

a: acceleration

d: displacement

Substituting values we have:

From here, we clear the value of the initial velocity.

We have then:

The speed of the car just before breaking was:

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.)