# Kinematics in 1D

#### Darth Frodo

1. 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?
1. Homework Statement

2. Homework Equations

3. The Attempt at a Solution

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#### SammyS

Staff Emeritus
Homework Helper
Gold Member
1. 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?
1. Homework Statement

2. Homework Equations

3. The Attempt at a Solution

#### Darth Frodo

Ah, Nevermind error found

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