By using uniform motion, the distance traveled by the car is 216 m.
We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
vo = 15 m/s
vt = 21 m/s
t = 12 s
Find the acceleration
vt = vo + a . t
21 = 15 + a . 12
12a = 6
a = 0.5 m/s²
By using the third equation, we can calculate the distance
s = vo . t + 1/2 . a . t²
s = 15 . 12 + 1/2 . 0.5 . 12²
s = 180 + 36
s = 216 m
Find more on uniform motion at: https://brainly.com/question/28040370
#SPJ4
