A car with a mass of 1.2 × 103 kilograms starts from rest and attains a speed of 20 meters/second in 5 seconds. What net force acted on the car to cause that acceleration?. A. . 3.0 × 102 newtons. B. . 6.0 × 102 newtons. C. . 1.2 × 103 newtons. D. . 4.8 × 103 newtons. E. . 1.2 × 104 newtons

Respuesta :

The net force (F) of the system is the product of the mass and the acceleration. The mass of the car is 1.2x10³ kg. The acceleration is the quotient when you divide the velocity by time. The acceleration is (20 m/s / 5 s) which is equal to 4 m/s². The net force is,
                         F = ma = (1.2x10³ kg)(4 m/s²) = 4.8 x 10³ N
Thus, the answer is letter D.

The net force acting on the car to cause the acceleration is 4.8 × 10³ Newtons.

Option D) 4.8 × 10³ Newtons.

What is force?

A force is simply referred to as either a push or pull of an object resulting from the object's interaction with another object.

From Newton's Second Law, force is expressed as;

F = m × a

Where is mass of object and a is the acceleration

Given the data in the question;

  • Mass of car m = 1.2 × 10³kg
  • Initially at rest, Initial velocity u = 0
  • Final velocity v = 20m/s
  • Time elapsed t = 5s
  • Net force F = ?

First, we determine the acceleration of the car.

From the first equation of motion;

v = u + at

a = ( v - u ) / t

a = ( 20m/s - 0 ) / 5s

a = 4m/s²

Now, Newton's Second Law;

F = m × a

F = ( 1.2 × 10³kg ) × 4m/s²

F = 4.8 × 10³kgm/s²

F = 4.8 × 10³N

The net force acting on the car to cause the acceleration is 4.8 × 10³ Newtons.

Option D) 4.8 × 10³ Newtons.

Learn more about force here: brainly.com/question/27196358

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