Maria is painting the trim on the top of a building. She drops her paintbrush. The paintbrush has a velocity of 29.4 m/s when it hits the ground 3 s later. What is the acceleration of the paintbrush?
Use the formula
3 seconds later suggests that the change in time was 3 seconds.
The final velocity is 29.4m/s
The initial velocity is 0 because that was the velocity of the paintbrush just as it started its descent.
This is the speed of acceleration due to gravity on Earth. Initially, you could've solved it by looking at it but I wanted to give you how to work out answers like this.