a bike racer is riding on his new bike at silverstone. The track is 4km long. What is his average velocity over one lap?
Hard to say when we do not know how long it took.
To calculate the average velocity, we need to know both the distance covered and the time taken. However, you haven't provided the time it took for the bike racer to complete one lap.
If you have the time taken, you can calculate the average velocity by dividing the distance by the time. For example, if the bike racer completed one lap in 10 minutes:
Average velocity = Distance / Time
= 4 km / 10 min
= 0.4 km/min
So, the bike racer's average velocity over one lap would be 0.4 kilometers per minute.