Aman cycles to school in three parts: 3 km in 15 minutes, 1.5 km in 15 minutes (stuck in traffic)…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Aman cycles to school in three parts: in minutes, in minutes (stuck in traffic), and in minutes.
- Find the total distance and total time.
- Find his average speed in km/h and in m/s.
- In which part was he fastest?
Need a reminder? The key ideaShow
Speed distance time; velocity displacement time. Average speed total distance total time. .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Totals. in .
Step 2. Average speed. , and .
Step 3. Fastest part. Part 1: ; part 2: ; part 3: . Part 3 was fastest.
Answer: in min; or ; part 3.
Watch out. The average speed is not the mean of the three speeds.
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