Question

question 1 - 4
over the course of 5 seconds, a car that is driving 30 m/s slows down until it is 10 m/s. what is its acceleration?
-2 m/s²
-4 m/s
2 m/s²
-4 m/s²
4 m/s

Explanation:

Step1: Identify known quantities

Initial velocity \( u = 30 \, \text{m/s} \), final velocity \( v = 10 \, \text{m/s} \), time \( t = 5 \, \text{s} \)

Step2: Use acceleration formula

\( a = \frac{v - u}{t} \)

Step3: Substitute values

\( a = \frac{10 - 30}{5} = \frac{-20}{5} = -4 \, \text{m/s}^2 \)

Answer:

-4 m/s²