Question

You approach a stop sign on a road going 10m/s, from the moment you stepped on the brakes to the moment you stopped completely is 5 seconds, what was your acceleration?

Answer 1

Answer:

a = -2m/s^2

Explanation:

Given: Initial Velocity is 10m/s, Final Velocity is 0, time is 5 seconds

Required: acceleration

Analysis: a = vf-vi/Δt

Solution:

a = 0-10/5

a = -10/5

a = -2

Paraphrase: Your acceleration is -2m/s^2

(remember that acceleration is in the opposite direction when slowing down, hence why acceleration is negative)