A car kinematics problem

  • Thread starter miamiheat5
  • Start date
  • #1
14
0
Suppose a car travelling at 12.0m/s sees a traffic light turn red. After 0.510s have elapsed, the driver applies the brakes, and the car decelerates at 6.20m/s^2. What is the stopping distance of the car, as measured from the point where the driver first notices the red light?


Homework Equations



d=vt
vf^2=vi^2+2ad



The Attempt at a Solution



d before breaking
d=vt
=12(0.51)
d=6.12m

d after breaking

vf^2=vi^2+2ad
0^2=12^2+2(-6.20)d
-144=2(-6.20)d
d=11.6m
 

Answers and Replies

  • #2
seems like you got it right.
 
  • #3
90
0
looks right to me
 

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