3. a car approaches a stop sign going 5 m/s before it comes to a stop. if it does this in 4 seconds, what…
3. a car approaches a stop sign going 5 m/s before it comes to a stop. if it does this in 4 seconds, what was its acceleration?
Answer
Explanation:
Step1: Identify the known - values
Initial velocity $u = 5\ m/s$, final velocity $v=0\ m/s$, time $t = 4\ s$.
Step2: Use the acceleration formula
The formula for acceleration is $a=\frac{v - u}{t}$. Substitute the values: $a=\frac{0 - 5}{4}$.
Step3: Calculate the acceleration
$a=\frac{- 5}{4}=-1.25\ m/s^{2}$.
Answer:
$-1.25\ m/s^{2}$