Question

if a car goes from 17 mph to 45.3 mph in 5 seconds, what was its acceleration?

answer:

what are the units for your answer?

select one:
○ mph/s
○ mph
○ miles
○ hours
○ seconds

Explanation:

First Sub - Question (Acceleration Calculation)

Step1: Recall acceleration formula

Acceleration \(a=\frac{\Delta v}{\Delta t}\), where \(\Delta v = v_f - v_i\), \(v_f = 45.3\) mph, \(v_i = 17\) mph, \(\Delta t=5\) s.
\(\Delta v=45.3 - 17 = 28.3\) mph

Step2: Calculate acceleration

\(a=\frac{28.3}{5}=5.66\)

Acceleration is change in velocity over time. Velocity unit is mph, time unit is s, so unit is mph/s.

Answer:

\(5.66\)

Second Sub - Question (Units of Acceleration)