Aprojectile of mass moving with speed in the direction strikes a stationary target of mass head-on. the collision is elastic. use the momentum principle and the energy principle to determine the final velocities of the projectile and target, making no approximations concerning the masses. (use the following as necessary: , , and .)

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?