contestada

An automobile of mass 2000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10000 N. How far does the car travel before stopping?

Respuesta :

Answer:

The car traveled the distance before stopping is 90 m.

Explanation:

Given that,

Mass of automobile = 2000 kg

speed = 30 m/s

Braking force = 10000 N

For, The acceleration is

Using newton's formula

[tex]F = ma[/tex]

Where, f = force

m= mass

a = acceleration

Put the value of F and m into the formula

[tex]-10000 =2000\times a[/tex]

Negative sing shows the braking force.

It shows the direction of force is opposite of the motion.

[tex]a = -\dfrac{10000}{2000}[/tex]

[tex]a=-5\ m/s^2[/tex]

For the distance,

Using third equation of motion

[tex]v^2-u^2=2as[/tex]

Where, v= final velocity

u = initial velocity

a = acceleration

s = stopping distance of car

Put the value in the equation

[tex]0-30^2=2\times(-5)\times s[/tex]

[tex]s = 90\ m[/tex]

Hence, The car traveled the distance before stopping is 90 m.