Answer:
Part A;
- Increases
- Increases
Part B:
- Constant but not 0
- 0
Explanation:
Part A:
>> Looking at the speed - time graph of Airplane A, we can see that speed increases from rest at 0 seconds time to time.
>> In graph of airplane B, we can see that distance gradually increases from time at 0 to time at t1. This means that the speed is increasing.
Part B:
>> From time t1 to time t2, we see in airplane A graph that the motion is indicated a horizontal line which means there is constant motion and in constant motion, speed is constant but not zero.
>> In graph of airplane B, we see that the distance between time t1 to time t2 didn't increase. This means that there was no movement. As a result, speed will be 0