7. Two billiard balls of equal mass, one blue and the other red, slide towards each other at 2.0m/s in opposite directions towards each other. They collide head on and rebound both at 1.8m/s in opposite to their original
velocities, a s shown in the diagram below. Show how momentum is conserved in this collision.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?