At which times are there forces acting on the cars? 1.) As they speed up while leaving their docking stations.

2.) As they move towards each other at their set velocities.

3.) While they are in contact during the collision.

4.) After they have collided and are no longer touching.

a

explanation:

because they are cartillidge

a electromagnetic waves

option number c is the right answer.

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.