# Finding Velocity

1. Mar 13, 2013

### KTiaam

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

Given the Information in the attachment and
m = 5.0 kg

a) find how far the mass moves before stoping
b) find it's velocity at t = 5.0s

i only need help on part B

Information i found from part A
distance = 4.72 meters
work = 19.6 Joules

2. Relevant equations

3. The attempt at a solution

I know you need to use Vo which is 2.8 m/s but I dont know what formula to use.

v = vo + at

but i have no acceleration.

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Last edited: Mar 13, 2013
2. Mar 13, 2013

### rude man

I got a slightly different number for distance traveled.

acceleration: how about F/m? And remember signs ...

3. Mar 13, 2013

### KTiaam

F = ma

I found Force by dividing Work over Distance

Then I used f=ma

Found a = -0.83

Then I used V = Vo + at

and got V = -1.36.

Thank you.

4. Mar 13, 2013

### rude man

Yer' welcome. You could also have used F = 4.8cos30.

(P.S. I misread F = 4.8. You got the right answer for distance as you know by now.)