Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 3 s. what is your acceleration? i need the answer and the units

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap

What is the speed of an object at a given moment?