help for part b of this question please 🙏 (1 Viewer)

[waltssillyhat]

i found part a and my answer was a deceleration of 0.6944...m/s, which was correct. i tried solving part b, but i kept getting an answer different from the textbook (the textbook answer is 250m)

 

[cheesynooby]

using the kinematic equation s = ut + (1/2)at^2 (as the acceleration is constant) and the direction the car is moving as the positive direction (so the acceleration is in negative direction) and converting 90km/h to m/s

 

[Shavi Masee]

the mass of the car doesn't matter here if that was the confusing bit

 

[waltssillyhat]

View attachment 46729
using the kinematic equation s = ut + (1/2)at^2 (as the acceleration is constant) and the direction the car is moving as the positive direction (so the acceleration is in negative direction) and converting 90km/h to m/s

oh i just realised that i did this but i just forgot to convert 90km/h into m/s

 

[waltssillyhat]

the mass of the car doesn't matter here if that was the confusing bit

no i just forgot to convert 90km/h into m/s