# Kinematics and One Dimensional Motion

• ayans2495

#### ayans2495

Homework Statement
A car is travelling at 120 km/h, when the driver sees a herd of cows on the road ahead and slams on the brakes. The performance of the car’s brakes is such that the car comes to a stop in a distance D meters. Assuming that the acceleration of the car under braking is independent of the car’s speed, what distance would the car require to come to a stop if it were travelling at 40 km/h instead?
Relevant Equations
v=d/t, x=ut+1/2at^2
Would we assume that the deceleration of both instance are the same?

ayans2495 said:
Would we assume that the deceleration of both instance are the same?
I think that's what the question is trying to say, by
Assuming that the acceleration of the car under braking is independent of the car’s speed,

hmmm27 said:
I think that's what the question is trying to say, by
Don't worry, I've figured it out. It's D/9. Thank you though.

ayans2495 said:
Don't worry, I've figured it out. It's D/9. Thank you though.
Not going to ; cheers.