Let's solve each problem step by step, following the instructions to
show all steps and
round answers to one decimal place.
---
1. If a car travels 400.0 m in 20.0 seconds, how fast is it going?
We use the formula for speed:
\[
\text{Speed} = \frac{\text{Distance}}{\text{Time}}
\]
Given:
- Distance = 400.0 m
- Time = 20.0 s
\[
\text{Speed} = \frac{400.0}{20.0} = 20.0 \, \text{m/s}
\]
✔ Answer: 20.0 m/s
---
2. If you drove 70.0 meters in 10.0 seconds, what is your speed?
Again, use:
\[
\text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{70.0}{10.0} = 7.0 \, \text{m/s}
\]
✔ Answer: 7.0 m/s
---
3. You arrive in science class in 10.0 seconds after sprinting 90.0 meters from math. What’s your speed?
\[
\text{Speed} = \frac{90.0}{10.0} = 9.0 \, \text{m/s}
\]
✔ Answer: 9.0 m/s
---
4. A plane travels 350,000.0 meters in 9000.0 seconds. What was its speed?
\[
\text{Speed} = \frac{350,000.0}{9000.0} = 38.888... \approx 38.9 \, \text{m/s}
\]
(Rounded to one decimal place)
✔ Answer: 38.9 m/s
---
5. (BE CAREFUL!) It takes Serena 2.25 hours to drive to school. Her route is 18.0 km long. What is Serena’s average speed on her drive to school?
Note: Distance is in
kilometers, time is in
hours, so speed will be in
km/h.
\[
\text{Speed} = \frac{18.0 \, \text{km}}{2.25 \, \text{h}} = 8.0 \, \text{km/h}
\]
✔ Answer: 8.0 km/h
>
✔ *Note: The unit is km/h because both distance and time are in compatible units.*
---
6. How much time will it take for a bug to travel 1.2 meters across your floor if it is traveling at 1.00 m/s?
Use the rearranged formula:
\[
\text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{1.2}{1.00} = 1.2 \, \text{seconds}
\]
✔ Answer: 1.2 s
---
7. You need to get to class, 200.0 meters away, and you are walking at 1.5 m/s. How much time will it take to get to class, in seconds?
\[
\text{Time} = \frac{200.0}{1.5} = 133.333... \approx 133.3 \, \text{seconds}
\]
✔ Answer: 133.3 s
---
✔ Final Answers Summary:
1.
20.0 m/s
2.
7.0 m/s
3.
9.0 m/s
4.
38.9 m/s
5.
8.0 km/h
6.
1.2 s
7.
133.3 s
All answers are rounded to
one decimal place as requested.
Parent Tip: Review the logic above to help your child master the concept of distance rate time worksheet.
