Finding force to accerate with given speed and time

[tutojean]

Homework Statement

An automobile of mass 1000 kg is traveling 10 m/s. What force is necessary to accelerate it to 50 m/s in 8 sec?

Homework Equations

Used Sigma(F) = (m)(a)

Sigma F = force
m = mass
a = acceleration

The Attempt at a Solution

F = ma
Sigma F = (1000)(50-10)
And that number is way too high. I don't really know how to approach this problem or even what I should use. Please help. Thank You.

 

[Doc Al]

First you need to calculate the acceleration properly. 50-10 m/s is the change in velocity. What's the acceleration?