1. The problem statement, all variables and given/known data A silo is under construction and a large brick is being hoisted up at a constant speed of 3.2m/s. The rope breaks when the brick is at a height of 28m above the ground. a) find the greatest height reached by the brick. 2. Relevant equations i know which equation to use: v^2 = vo^2 = 2a(x2-x1) 3. The attempt at a solution At the greatest height, i know final velocity will be zero. in the solution, a is negative. this is where i get confused....i thought a is negative therefore slowing down, but is a negative because it's going down?