Final answer:
To calculate Jackie's average speed, the time taken for the trip is required. Average speed is calculated by dividing the total distance by the total time. Vehicle type, weather conditions, and journey start time are not relevant for this calculation.
Step-by-step explanation:
To calculate Jackie's average speed, the necessary information needed is the time taken for the trip (a). The average speed is the total distance traveled divided by the total time of the trip. Other factors such as the type of vehicle used (b), weather conditions (c), or the starting time of the journey (d), are not necessary for this calculation. For example, suppose a car travels 150 kilometers in 3.2 hours. Its average speed (Vavg) would be calculated as:
Vavg = distance / time = 150 km / 3.2 h = 46.875 km/h.
In this case, you would round the average speed to the nearest whole number, which would be 47 km/h. It's important to note that average velocity is calculated differently and takes direction into account, as shown by Jill's example where her total displacement affects her average velocity while her total distance affects her average speed.