Your car is initially moving at 16.8 m/s when your hit the brakes and the car begins to slow down. The car has a mass of 621 kg and
the coefficient of friction between the tires and the road is 0.7.
What is the time needed to stop the car and how much ground
does it cover during this process?

i think the answer would be b

frequency or wavelenth of em radiation in a vacuum

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.