# Basic force question(should be too easy)

1. Apr 5, 2008

### aaquib

1. The problem statement, all variables and given/known data
A supertanker of mass 1.0 X 10^8 travels 3.5km, reaching a speed of 4.1km/h from rest. What was the magnitude of the unbalanced force acting on it?

2. The attempt at a solution

I got the acceleration(2.4m/s^2), but how do I fit this into the equation? The answer is 18529.5N, but I have no idea how they got that.

2. Apr 5, 2008

### Snazzy

$$W=\Delta KE$$

3. Apr 5, 2008

### aaquib

Ive only taken physics for 2 months in my life, so please excuse me, but what the heck is W and what the heck is KE?

4. Apr 5, 2008

### Snazzy

W is work, KE is the kinetic energy.

5. Apr 5, 2008

### aaquib

Im not used to using that formula. I usually use force=mass X acceleration.

6. Apr 5, 2008

### Snazzy

Well, your acceleration is wrong, possibly due to the fact you forgot to convert units.