Answer:
1.
100-yard dash
If someone is running a 100-yard dash, they have a time limit or the time they took to run it. They are also going a certain speed. This makes it so that both speed and time could be on a graph representing a 100-yard dash.
Drag racing
The same thing as an 100-yard dash. If someone is driving in a drag race, they have a time limit or the time they took to run it. They are also going a certain speed. This makes it so that both speed and time could be on a graph representing a drag race.
Golf
When someone is golfing, they don't usually keep track of their time or speed. They keep track of the amount of hits someone does over the course of the game.
Skydiving:
People don't often keep track of skydiving factors. It may be a sport, but it is not a sport you can win. No point in keeping track of speed or time.
Fishing
I guess you could keep track of how long it takes for you to catch a fish. But why would you need speed? Maybe to keep track of how fast you reel in the fish.
Final answer:
You can decide. I am only here to give reasonings.
2.
The graph has a sudden drop of speed shown. This effects to choice of a sport by showing that the speed goes down in a fast manner, you should figure out why. The time seems to stay on track. Maybe a timer is running that isn't affected by the speed.
3.
Depends on what you pick... I can give you a start
Golf
Golf is represented on the graph. The speed is based on how fast the ball is going after it was hit and the time is representing how fast it is going overtime until it stops.
Skydiving
Skydiving is represented on the graph. The speed is based on how fast the person is falling. The time is representing how long they have been falling for. The spike is due to the person opening their parachute.
Fishing
The sport of fishing is represented on the graph. The speed represents how quickly the person reels in the fish. The time is representing how long it takes for them to reel in the fish. The spike is there due to the fact that they reeled it in slower because the fish is out of water and is being pulled in on land.
100-yard dash
The 100-yard dash is represented on the graph. The speed represents how quickly the person is running the course of time shown. The time represents how long they were running for. The spike shows they skidded to a stop due to lack of stamina and had to start a slow jog or walk.
Drag racing
The sport of drag racing is represented on the graph. The speed shows how fast the automobile is going over the course of the race. The speed is how long the care was moving for. The spike represents the sudden lack of gas and the car slowing down until it reaches a complete stop at the end.