I solved a problem my teacher assigned, but I don't know if I did it right. The question is: A person standing on the roof of a building throws a brick straight down at 7 m/s. THe brick hits the ground 4 seconds later. Calculate: a) The velocity at which the brick hits the ground (I got 46.24 m/s) b) The height of the building (I got 106.48 m) c) If the brick is thrown upward instead, at 7 m/s, how much longer will it take to hit the ground? (I said it would take 11.108 s) Thanks.