You are in a car traveling at 100 m/s. You are hitting both your brakes, giving a constant acceleration of -5 m/s^2. How much time does it take you to stop? How far have you done in that time?

Answer 1

If the Velocity is 100m/s, and the acceleration is -5m/s, simply use the formula: a= (v2-v1)/t and solve for the time. If this is a calculus based class, you can then integrate the equation for velocity/acceleration, using 0 and the time you found to find the distance traveled. Otherwise, you can use the Distance formula: d= v*t +(1/2 a*t^2).

Answer 2

use v2=v1^2+2ad and a=v/t

t=v/a, so t=100/5 = 20 seconds

then 0=100^2+2(-5)*d and then d = 10000/10 = 1000 meters.

not to mention that 100 m/s is over 220 mph...