Is there another equation that is simplistic compared to this one. I don't understand why she keeps moving numbers around.

D Solution: Vf= 0 ( as given in the problem) intent/1264486/viewContent/19775885/View a= -4.7m/s^2, Vi= 31m/s, d=? In this problem, time is not given. You can solve it in two steps, calculate time using the formula a=(Vf-Vi) /t and then use the equation x= xo+vot+ 1/2 at^2 OR PDF.js viewer Use the equation V^2= Vi^2+ 2ax where x= displacement 0= (31m/s) 12 + 2(- 4.7m/s^2).x 0- (31m/s) ^2= 2(-4.7m/s-2).x Dividing both sides by (-4.7 m/s^2) X= -(31m/s)^2 / - 4.7m/s^2= 102 m