Today we are doing questions online about different kind of graphs and questions about velocity and acceleration.
Part One
1) Instantaneous speed is your speed at one given instant and average speed a measure of the distance traveled in a given period of time. You are reading the instantaneous velocity of the car when you are looking at the speedomerter.
2) Constant speed is when you are going the same speed for a period of time. 300 m
3) Acceleration is the rate an object changes its velocity over a period of time. a= velocity/time.Units are m/s/s, m/hr/s, km/hr/s. 28m/s
Part 2
1) The slope of a position time graph is velocity. The velocity increases. 
2) -3m/s and 4m/s. You determine slope by subtracting final distance and initial distance divided by final time subtract initial time.    
3) The slope of a velocity time graph is acceleration. The line for acceleration will be going on a upper rightward slope, deceleration is going to be the opposite.
Part 3
1) It means they don't encounter air resistance. They are free falling at 9.8 m/s/s
2) The velocity is increasing as its falling. It is accelerating at 3.75 m/s/s