1. The steepest part of the journey is between 0 and 2 hours, as this section has the greatest gradient, indicating the highest speed.
2. The car was parked for 1 hour, as shown by the flat section of the graph between 2 and 3 hours where the distance does not change.
3. The total distance traveled is 100 km (50 km out and 50 km back).
4. The average speed for the entire journey is 25 km/h, calculated by dividing the total distance (100 km) by the total time (4 hours).
5. The speed during the first hour is 25 km/h, found by calculating the gradient of the line from 0 to 1 hour: (25 km - 0 km) / (1 h - 0 h).
6. The speed during the second hour is 25 km/h, found by calculating the gradient of the line from 1 to 2 hours: (50 km - 25 km) / (2 h - 1 h).
7. The speed during the third hour is 0 km/h, as the distance remains constant at 50 km.
8. The speed during the fourth hour is 50 km/h, found by calculating the gradient of the line from 3 to 4 hours: (0 km - 50 km) / (4 h - 3 h), which equals -50 km/h; the negative sign indicates direction, so the speed is 50 km/h.
Parent Tip: Review the logic above to help your child master the concept of speed time graph worksheet.
