Finding forces for connected boxes moving at constant speed

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HTT
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Homework Statement


three boxes connected by strings.
given the mass of each box, coefficient of static and kinetic friction, and a constant speed of 2.0 m/s

I want to know how to get force by a given speed...!
Also, at a constant speed, how do I get to know the acceleration? does a = 0? if a = 0, how can I find Forces?

Homework Equations



F = ma

The Attempt at a Solution

 

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HTT said:

Homework Statement


three boxes connected by strings.
given the mass of each box, coefficient of static and kinetic friction, and a constant speed of 2.0 m/s

I want to know how to get force by a given speed...!
Also, at a constant speed, how do I get to know the acceleration? does a = 0? if a = 0, how can I find Forces?

Homework Equations



F = ma

The Attempt at a Solution


Start this kind of problem by drawing a free body diagram (FBD) of each of the crates. Be sure to show the frictional forces... that is how you can have a force even when the net acceleration is zero...