An MSU linebacker of mass 120.0 kg sacks a UM quarterback of mass 88.0 kg. Just after they collide, they are momentarily stuck together, and both are moving at a speed of 2.80 m/s. If the quarterback was at rest just before he was sacked, how fast was the linebacker moving just before the collision?

Mary starts from her house, walks 80 meters south, and stops to chat with her aunt on the sidewalk. after chatting for a few minutes, she walks 125 meters to the west to meet a friend and then walks 45 meters north with her friend to a cafe for lunch. overall, she takes 10 minutes to do all this. what is mary’s average speed?