an automobile with the mass of 2000 kg is moving north on a level, striaght highway with a constant velocity of 80 km/h. what is th unbalanced force acting on the automobile

To determine the unbalanced force acting on the automobile, we can use Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and acceleration.

Given that the automobile is moving with a constant velocity of 80 km/h, we need to convert this into meters per second (m/s) since the SI unit of force is Newton (N) and the SI unit of velocity is meters per second.

1 kilometer = 1000 meters
1 hour = 3600 seconds

So, 80 km/h can be converted to:

80 km/h = (80 * 1000) meters / (3600 seconds)
= 22.22 m/s

Now, since the automobile is moving with a constant velocity, we know that the acceleration is 0 m/s^2, since acceleration refers to changes in velocity.

Using Newton's second law:

Force = Mass x Acceleration

Given that the mass of the automobile is 2000 kg, and the acceleration is 0 m/s^2, we can substitute the values:

Force = 2000 kg x 0 m/s^2
= 0 N

Therefore, the unbalanced force acting on the automobile is 0 Newtons (N).

Hint: Concentrate on the "constant velocity". That tells you all you need to know about the "unbalanced" (net) force.