Question

question 8 (1 point)
if you are driving 72 km/h along a straight road and you look to the side for 4.0 s,
how far do you travel during this inattentive period?
18 m
20 m
40 m
80 m

Explanation:

Step1: Convert speed unit

The speed \(v = 72\ km/h\). To convert it to \(m/s\), use the conversion factor \(1\ km = 1000\ m\) and \(1\ h=3600\ s\).

$$v=\frac{72\times1000}{3600}\ m/s = 20\ m/s$$

Step2: Calculate the distance

Use the formula \(d = v\times t\), where \(v = 20\ m/s\) and \(t = 4.0\ s\).

$$d=20\times4=80\ m$$

Answer:

80 m