select the correct answer.\na car accelerates from rest to a velocity of 5 meters/second in 4 seconds. what…
select the correct answer.\na car accelerates from rest to a velocity of 5 meters/second in 4 seconds. what is its average acceleration over this period of time?\na. its acceleration is 1.25 meters/second.\nb. its acceleration is 5 meters/second.\nc. its acceleration is 0.8 meters/second.\nd. its acceleration is 1.25 meters/second².\ne. its acceleration is 20 meters.
Answer
Explanation:
Step1: Recall acceleration formula
Acceleration $a=\frac{\Delta v}{\Delta t}$, where $\Delta v$ is change in velocity and $\Delta t$ is change in time. The car starts from rest, so initial velocity $u = 0$ m/s, final velocity $v=5$ m/s, and $\Delta t = 4$ s. Then $\Delta v=v - u=5 - 0=5$ m/s.
Step2: Calculate acceleration
$a=\frac{\Delta v}{\Delta t}=\frac{5}{4}=1.25$ m/s².
Answer:
D. Its acceleration is 1.25 meters/second²