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**[SOLVED] Net Force of object changing velocity**

Hi, I'm studying for a test, so there might be a few of these in the next hour or so.

**1. Homework Statement**

A supertanker of mass 1.0 X 10[tex]^{8}[/tex] kg travels 3.5km, reaching a speed of 4.1km/h from rest. What was the magnitude of the unbalanced force acting on it?

**2. Homework Equations**

Fnet = ma

v[tex]^{2}_{2}[/tex] = v[tex]^{2}_{1}[/tex] + 2a[tex]\Delta[/tex]d

**3. The Attempt at a Solution**

I tried (4.1km/h)[tex]^2[/tex] = 2a(3.5km)

[tex]\frac{16.81km/h^2}{3.5km}[/tex] = 2a

4.80km = 2a

2.4km/h = a

and then I tried converting it by dividing it by 60 twice, and sliding to the right 3 decimal places, then inserting it into the Fnet = ma.

I'm really stuck, and that's not good if I have a unit test tomorrow

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