Finding velocity when onlu a mass and acceleration is given

1. Nov 18, 2011

mkmaitla

1. The problem statement, all variables and given/known data
The instruments attached to a weather balloon have a mass of 5.0kg.The balloon is released and exerts an upward force of 98 N on the instruments. I have found that the acceleration is 1.96 m/s/s by F=ma.
After the balloons have accelerated for 10 seconds, the instruments are released. What is the velocity of the instruments at the moment of their release?

2. Relevant equations
I have tried this but I don't know either velocity or the distance.
or would it be:
V(sub f) = V(sub i) +at

3. The attempt at a solution
V(sub f)^2= 0^2 + (2)(1.96m/s^2)(d)
or
V(sub f)= 0 + (1.96m/s^2)(10s)
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Nov 18, 2011

Pengwuino

Be careful, that's not the acceleration. How did you figure out what the acceleration was?

Once you know the acceleration, you also know that

$v = v_0 + at$

It's assumed to be released from rest, so $v_0 = 0$. It's a simple matter of letting $t = 10 sec$. Remember, the question is quite simple since it only asks for what happens at the release.

3. Nov 18, 2011

mkmaitla

Oh okay. I looked at the calculator wrong for the decimal. So the initial velocity is 0?

4. Nov 18, 2011

Millacol88

The force exerted by the balloon on the instruments is 98N, but what is the net force after accounting for gravity?

5. Nov 18, 2011

mkmaitla

is it 10?

6. Nov 18, 2011

Millacol88

How did you arrive at that? E.G. which equation did you use?