Does V0 affect acceleration under constant Force?

[VinnieD]

Homework Statement

A block of mass M = 10 kg is sitting on the table as shwoin Figure above. There is friction between the block and the table, the coefficient of friction is u = 0.1.
The block has initial velocity V, and a constant forceF is applied to the black as showing Figure above.
A) For the case of V = 0 and F = 5 N, find acceleration of the block
B) Constant force is F = 5N, and at time t = 0, the initial velocity is v = 2 m/s, find acceleration of the block.
C) Constant force is F = 15N, and at time t = 0, the initial velocity is v = 2 m/s find acceleration of the block.

It asks to find the dependence of velocity and position as functions of time, but I assume i just integrate to find those.

Homework Equations

ΣF=ma
F_f=μN

The Attempt at a Solution

F₀-F_f=10kg(a)
a=(5N-10N)/10kg; a=0

So I think the acceleration is 0 in both cases, but I'm uncertain if the initial velocity would have an effect. Assuming I derived a correctly V₀ doesn't affect a, but I'm honestly not sure.

 

[Doc Al]

You didn't state the problem, but in any case acceleration only depends on the net force.

 

[Doc Al]

a=(5N-10N)/10kg; a=0

(5 - 10)/10 does not equal zero.

 

[VinnieD]

I know in the first case the force of friction is greater than the applied force so its a is 0.
How do I find the acceleration of the second case with the V₀ of 2?

Is it just -.5m/s²

 

[Doc Al]

Please state the complete problem!