# Speed of Block after Newton's Second Law

1. Mar 3, 2013

### idllotsaroms

1. The problem statement, all variables and given/known data

http://postimage.org/image/6exf0w475/

B)
I have a question on this part. Would I just use the "v = v0 at" equation here because the question states "after it starts moving?" Do i need to include static/kinetic friction into this equation somehow?

2. Relevant equations

part a) Newton's Second Law

part b) v=v0 at

3. The attempt at a solution

For part A, I found the acceleration to be (Tcos∂-((mg-Tsin∂)*$\mu$k)) / m

For part B I'm thinking that I use "v = v0 at" but the "after it starts moving" part of the question confuses me. Does it mean that v0 would be 0?

2. Mar 3, 2013

### Staff: Mentor

That's fine. (Where you use T instead of F.)

Yes, v0 = 0. The equation you mean is v = v0 + at.