Dinstance traveled with a constant force?

[disque]

Homework Statement

A constant force of 396 N acts on a spacecraft of mass 7890 kg that has an initial velocity of 34 m/s. How far has the spacecraft traveled when it reaches a velocity of 4890 m/s?

The Attempt at a Solution

I tried doing F=ma and got the a= 19.92 and then setting up a=(vf-vi)/delta t

Didn't work...
I don't know what I did wrong. Please help. thank you

 

[disque]

Distance traveled with a constant force

Homework Statement

A constant force of 396 N acts on a spacecraft of mass 7890 kg that has an initial velocity of 34 m/s. How far has the spacecraft traveled when it reaches a velocity of 4890 m/s?


Tried setting it up with f=ma then taking (delta)v/(delta)t=a to find the position

 

[LowlyPion]

Homework Statement

A constant force of 396 N acts on a spacecraft of mass 7890 kg that has an initial velocity of 34 m/s. How far has the spacecraft traveled when it reaches a velocity of 4890 m/s?


Tried setting it up with f=ma then taking (delta)v/(delta)t=a to find the position

Maybe after finding the acceleration you would use

Vf² = Vi² + 2*a*x

to yield the distance

 

[berkeman]

Merged two threads with the same question by disque (that's why there appear to be two original posts).