Did I Solve the Object Thrown Vertically Upwards Problem Correctly?

[Darth Frodo]

Homework Statement

5. An object is thrown vertically upwards with a speed of 72 kilometres per hour. How long does it take to reach a point 25 meters below the starting point? You can take g as 10 ms-2 for convenience.

Here is my answer. I got 4 yet the answer is 5.

http://i.imgur.com/Ewvwh.jpg

http://i.imgur.com/ynVmM.jpg

http://i.imgur.com/OBVsX.jpg

Am I correct?

Homework Statement

Homework Equations

The Attempt at a Solution

 

[SammyS]

Homework Statement

5. An object is thrown vertically upwards with a speed of 72 kilometres per hour. How long does it take to reach a point 25 meters below the starting point? You can take g as 10 ms-2 for convenience.

Here is my answer. I got 4 yet the answer is 5.

[IMG ]http://i.imgur.com/Ewvwh.jpg[/PLAIN]

[IMG ]http://i.imgur.com/ynVmM.jpg[/PLAIN]

[IMG ]http://i.imgur.com/OBVsX.jpg[/PLAIN]

Am I correct?

Homework Statement

Homework Equations

The Attempt at a Solution

Please reduce the size of your images.

 

[Darth Frodo]

Ah, Nevermind error found