1. The problem statement, all variables and given/known data You are on the roof of a physics building, which is 46.0 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant rate of 1.20 m/s. If you wish to drop an egg on your professor's head, how far from the building should the professor be when you release the egg? 2. Relevant equations 3. The attempt at a solution I took 46.0 and subtracted 1.80 for the height of the professor. That gave me 44.2 m. I then divided that by 9.80 m/s^2 for acceleration due to gravity. That gave me 4.51 s. I then divided that by 1.20 m/s for the velocity of the professor. This gave me an answer of 3.76 m. I typed this in and the masteringphysics said not quite, that I may have a slight error in calculuation or used the wrong number of significant figures. I recalculated several times and kept getting 3.76. Any ideas?