Question

question 3 of 25
a car speeds up from 5 m/s to 12 m/s in 20 seconds. what is the acceleration of the car?
a. 2.1 m/s²
b. 2.9 m/s²
c. 1.1 m/s²
d. 0.35 m/s²

Explanation:

Step1: Identify initial and final velocities and time

Initial velocity $u = 5$ m/s, final velocity $v=12$ m/s, time $t = 20$ s.

Step2: Use acceleration formula

The formula for acceleration $a=\frac{v - u}{t}$. Substitute the values: $a=\frac{12 - 5}{20}$.

Step3: Calculate the acceleration

$a=\frac{7}{20}=0.35$ m/s².

Answer:

D. 0.35 m/s²