Kinematics-motion in a straight line

[Mr. Poole]

Homework Statement

A dog sees a flowerpot sail up and then back past a window 5.0ft (1.77m) high. If the total time the pot is in sight is 1s, find the height above the top of the window to which the pot rises.

Homework Equations

standard set of kinematics equations are given;

V=Vo+at
V^2=Vo^2+2a(X1-X0)
X=Xo+Vot+(1/2)at^2
X=(1/2)(Vo+V)t
X=Vt-(1/2)at^2

The Attempt at a Solution

Using the last equation given above find the velocity at the top of the window

1.77=V(0.5)-(0.5)(-9.8)(0.5^2) solves for
V=1.09m/s

using equation 2 to calculate the distance traveled by the pot after passing the window

0^2=(1.09^2)+(2)(-9.8)(X) solves for
X=0.0606m

The answer is 1.91cm. I've tried other ways too, but I can't seem to come up with the solution. Please help!

 

[flatmaster]

Carefully look at your units. You're mixing feet and meters when you eventually plug your numbers in.

 

[Mr. Poole]

I went through carefully but I can't find any error with my units, I don't see how this would be possible anyways as I never use any data given in feet, only meters.