Before the collision, the blue marble is moving from left to right, and it has a velocity of 2m/s. The orange marble is moving at an equal speed, but in the opposite direction what is the velocity of the orange marble before the collision

3.2x10^7

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

electric field is a function of 1/r^2

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