Question

Jelani is in a walking race at his school. In the first 20 seconds he walks 60 meter in the next 30 seconds he walks 60 meters in the next 10 seconds he walks 35 meters.in the last 40 seconds he walks 80 meters. Describe how jelani’s walking rate chnages during this race.

Answer 1

To describe Jelani's walking rate during the race, we can calculate his average speed for each time interval and compare them.

Jelani's walking rate can be calculated using the formula:

Rate = Distance / Time

1. First 20 seconds:
Rate = 60 meters / 20 seconds = 3 meters/second

2. Next 30 seconds:
Rate = 60 meters / 30 seconds = 2 meters/second

3. Next 10 seconds:
Rate = 35 meters / 10 seconds = 3.5 meters/second

4. Last 40 seconds:
Rate = 80 meters / 40 seconds = 2 meters/second

From the calculations, we can see that Jelani's walking rate changes during the race. In the first 20 seconds and the next 10 seconds, his walking rate is higher at 3 meters/second and 3.5 meters/second, respectively. However, in the next 30 seconds and the last 40 seconds, his walking rate decreases to 2 meters/second.

Therefore, Jelani's walking rate starts at 3 meters/second, decreases to 2 meters/second, increases briefly to 3.5 meters/second, and then decreases again to 2 meters/second towards the end of the race.