# Homework Help: Spring mass system problems

1. Apr 14, 2010

### d.r

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

a mass attached to the lower end of a vertical spring causes the spring to extend by 25mm to its equilibrium position. The mass is then displaced a further 20mm and released. a trace of the vibration and time mesurements are taken. From these mesurements it can be seen that the displacement from the equilibrium position is 19.2mm when the time is 0.05s

A) calculate the expected frequency of vibration

B) calculate the maximum acceleration of the mass

C) calculate the maximum velocity of the mass

2. Relevant equations

i belive the frequency formule to be f=1/T Hz

3. The attempt at a solution

i am having an problem knowing were to start with this as i belive the key is finding out the weight of the Mass any help or pointers would be greatfully recived

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

2. Relevant equations

3. The attempt at a solution

2. Apr 14, 2010

### thebigstar25

maybe you want first to write what is the expression of the displacement , then solve the rest of the question ..

hint: note that you are dealing with a special kind of motion here ..

3. Apr 14, 2010

### d.r

would that be the equation x=Asin(wt+o)

4. Apr 14, 2010

### thebigstar25

good .. try to start from there and let us know what you will get ..

5. Apr 15, 2010

### d.r

I am still struggling to figure out how to use the displacement formule can anybody help to further highlight were i could start with this problem/Question

many thanks