1- Can you ride your bike on a circular highway at constant speed? How about at constant velocity? Explain the difference.

2- Two balls (red and black) are set to roll on opposite sides of a meter stick (each number is a centimeter). A camera is installed and it is set so that it takes one picture every three seconds starting at time t = 0 sec, when the balls begin to roll..

The superimposition of the images looks like this:

a- Is the black ball accelerating? Why?

b- Is the red ball accelerating? Why?

c- What are the average speeds of the black ball and that of the red ball?

d- What is the position on the ruler of the black ball at t = 7.5 seconds?

e- And that of the red ball?

3- A cyclist travels 28 kilometers in 20 minutes. Calculate the average speed of the cyclist in meters per second

4- A car accelerates, at a uniform rate of acceleration, from 0 km/h to 84 km/h in twelve seconds
What is this car's acceleration? Give your answer in both km/hour/sec and m/second2

5- Consider a situation with similar setup as in problem 2. Here the pictures are taken once every second, starting at t = 0 sec, both balls start at time t = 0, from x = 0 and from rest.

a- Is the black ball accelerating? Why?

b- What about the red ball? Is it accelerating?

c- What is the acceleration of the black ball? (Hint assume the acceleration is constant)

d- What is the acceleration of the red ball?