Recent content by JDR 007

Homework Statement Determine the stopping distances for a car with an initial speed of 85 km/h and human reaction time of 1.0 s for the following accelerations. (a) a = -4.0 m/s2 m (b) a = -8.0 m/s2 m Homework Equations d=v1+v2/2 *t a=change in velocity/timeThe Attempt at a Solution I...

A car slows down from 23 m/s to rest in a distance of 91 m. What was its acceleration, assumed constant? I only have one more try on this one... is -2.91 right?

I emailed my teacher And I will see what she says. I really hate these web assignments because they aren't multiple choice (hence wrong sigs, diff. calculators etc... will mess answers up due to rounding)

I totally was making that harder than it was, I would like to thank you for your help

58.5?...v1 26m/s v2 0m/s t=4.5

I copy and pasted the question it is exact

so.. 26*4.5-1/2(-5.78) what am I missing

I accidentally pluged accel. in for velocity

45.495m is that right?

x = x_0 + v_0 t + (1/2) a t^2 Should I try using this?

I used a minus sign...still wrong. It is a web based homework system and it is horrible. we have 4 trys to get it right...so i used a - sign then a + sign then scientific notation then changed my sig figs...so it says I am wrong but I don't see how.

[SOLVED] finding distance based off acceleration Homework Statement A car slows down uniformly from a speed of 26.0 m/s to rest in 4.50 s. How far did it travel in that time? Homework Equations Acceleration (you all know it) The Attempt at a Solution I am totally stuck all I can...

Homework Statement A sports car moving at constant speed travels 120 m in 4.7 s. If it then brakes and comes to a stop in 4.0 s, what is its acceleration? Express the answer in terms of g's, where g = 9.80 m/s2. (Take the positive direction to be the direction of travel.) Homework Equations...