The picture above shows a paintball gun that can fire a paintball with different initial velocities. A student shoots the paintball gun across level ground, and notices that
the paintball takes a certain amount of time to hit the ground when it is at a low
velocity. Explain why the student would expect the paintball would take the same
amount of time to hit the ground when it is fired with a higher initial velocity.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?