Aobject moving 2m/s experiences an acceleration of 3m/s for 8 seconds. how far did it move in that time

As per the question the initial velocity of object [u]=2 m/s

The acceleration of the particle  

The time is [t]= 8 seconds.

We are asked to calculate the distance travelled by the particle in that time.

As per equation of kinematics we know that-

Here s is the distance travelled by the object.

                                                  [ans]

it's a b and

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.