Question

Car A is traveling at a speed of 25 m/s, and car B is traveling at a speed of 20 m/s. At a clock reading of 0, the cars are 405 m apart.
(a) Use the diagram above to set up a coordinate system (number line), clearly labeling the p = 0 position and which direction is positive.
(b) Write the physics equation for each car using the coordinate system you defined above.

Answer 1

(a) The diagram is below:

(b) For the car moving at 25 m/s (blue one):

$$d_b=25t$$

For the green car:

$$d_g=405-20t$$