Driving on asphalt roads entails very little rolling resistance, so most of the energy of the engine goes to overcoming air resistance. but driving slowly in dry sand is another story. if a 1700 kg car is driven in sand at 4.8 m/s , the coefficient of rolling friction is 0.06. in this case, nearly all of the energy that the car uses to move goes to overcoming rolling friction, so you can ignore air drag in this problem.

a).

b).

Explanation:

The question have no final question but those kind of situation is usually find

a) What propulsion force is needed to keep the car moving forward at a constant speed?

b) What power is required?

a.

b.

answer: strength i guess

explanation:

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.