- #1
mizzy
- 217
- 0
Homework Statement
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.
Homework Equations
i know which equation to use:
v^2 = vo^2 = 2a(x2-x1)
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?