Question

As the shuttle bus comes to a sudden stop to avoid hitting a dog, it accelerates uniformly at -4.1 m/s² as it slows from 9.0 m/s to 0 m/s. Find the time interval of acceleration for the bus.

Answer 1

You just have to use the Vf=Vo+AT to solve it.
Vf= Is your "F"inal velocity
Vo= Is your "O"riginal velocity
A= Is your "A"cceleration.
So it'll look something like this when you put in your numbers.
\[0m/s=9.0m/s+(-4.1m/s^2)(t)\]
Just solve for "t" from there :D.