Force given mass and acceleration problem

[tworley1977]

Homework Statement

Here is the problems exactly as written in the homework:

A Ferrari accelerates from 0 to 100km/hr in 4.80 secs. What force (in Newtons) does a passenger with a mass of 68kg experience during the acceleration?

Homework Equations

a = v/t
F=ma

The Attempt at a Solution

Ok...seems pretty straightforward, but the answer I come up with comes back as wrong. Can anyone point out my error?

a=100/4.8=20.83km/hr

F=68*20.8 = 1416.4kg*km/hr = 1416.4N

 

[tworley1977]

Nevermind. I see what I over looked. Forgot to convert km/hr to m/s.