Question

Driving home from school one day, you spot a ball rolling out into the street. You...

Driving home from school one day, you spot a ball rolling out into the street. You brake for 1.20 s, slowing your 950-kg car from 16.0 m/s to 9.50 m/s. (a) What is the average force exerted on your car during breaking? (b) How far did you travel while breaking?

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Answer #1

Solution:

a) Using the concept of impulse,

Favgt = mv

Favg = mv/t

= 950*[9.50 - 16]/1.20

= - 5145.83 N.

b) Using kinematics equation,

Find the acceleration,

a = v - u/t

= 9.50 - 16 / 1.2

= -5.42 m/s2.

And finding the distance,

S = v2 - u2/2a

= 9.52 - 162/2*-5.42

= 15.3 m.

I hope you understood the problem and got your answers, If yes rate me!! or else comment for a better solutions.

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