Question

A 1,600 kg car is traveling with a speed of 20 m/s. Find the net force that is required to bring the car to a halt in a distance of 50m. Use the formula: a= (vf2-vi2)/2d regarding the relation among acceleration a, final velocity vf, initial velocity vi, and the traveled distance of an object d.

Answer 1

256N. I love physics so.... yerp

Answer 2

Net force that is required to bring the car to a halt =6400 N

Explanation:

Using kinematic equation to calculate the acceleration a

Vf²= Vi²+ 2 a d

Vf= final velocity=0

Vi= initial velocity= 20 m/s

a= acceleration

d= distance=50 m

0²= (20)²+ 2 a (50)

a=-4 m/s²

Now force= F = ma

m= mass= 1600 kg

F= 1600 (-4)

F=-6400 N

negative sign indicates that the force is opposing the motion of the car.