# What is the train's final speed?

1. Oct 29, 2008

### jjl15hid

1. The problem statement, all variables and given/known data

Hey guys..
A train traveling at 40km/h accelerates at a rate of 5.0m/s^2 for 0.80s.what is its final speed.

2. Relevant equations[/b
i belive this is the equation a=v1-v0/t

3. The attempt at a solution
Im totally stuck i tried but due to a lack of ti 84 i cant get the calculations...Please help

2. Oct 29, 2008

### Ithryndil

One thing you need to notice is that the initial speed is in km/h and the acceleration is in m/s^2 so I would adjust the initial velocity to be in m/s.

3. Oct 29, 2008

### Quincy

40 km/h = 11.1 m/s

Now Use this equation: Vf = Vo + at to solve for Vf.

4. Oct 29, 2008

### jjl15hid

so it would be Vf=0+5.0(.80)
which equals 4 so the answer would be 4km/h? im sorry you know the units?

5. Oct 29, 2008

### Quincy

Vo is 11.1 m/s, not 0. And the units are m/s.

6. Oct 29, 2008

### jjl15hid

thanks allot so heres my answer

v=11.1+5.0(.80)
4+11.1
15.1m/s?

7. Oct 29, 2008

### Ithryndil

As far as I can tell, that looks good.