What is the train's final speed?

[jjl15hid]

Homework Statement

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. Homework Equations [/b
i believe this is the equation a=v1-v0/t

The Attempt at a Solution

Im totally stuck i tried but due to a lack of ti 84 i can't get the calculations...Please help

 

[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.

 

[Quincy]

40 km/h = 11.1 m/s

Now Use this equation: V_f = V_o + at to solve for V_f.

 

[jjl15hid]

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

 

[Quincy]

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

 

[jjl15hid]

thanks allot so here's my answer

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

 

[Ithryndil]

As far as I can tell, that looks good.