# Vertical motion

1. Dec 8, 2005

### kingyof2thejring

A stone dropped from the roof of a building hits the ground travelling at speed 19.4 m s-1 . How tall is the building, in m?

is the final velocity 0? or what do you calculate first? to get s

2. Dec 8, 2005

### Integral

Staff Emeritus
The initial velocity is zero, you are given the final velocity. What equations do you have that include your givens and the distance of the fall.

3. Dec 8, 2005

### kingyof2thejring

relativistic motion

does anyone know the formula for v using the relativistic mass equation

i get v= the sqroot of(c^2- (restmass^2*c^2)/m^2)
rearrangeing the formula

4. Dec 8, 2005

cheers mate

5. Dec 8, 2005

### Integral

Staff Emeritus
You would be best off to learn the basics before including non measurable (for this problem) relativistic effects.

6. Dec 9, 2005

### vaishakh

Please look where do you post things. I just understood your mistake becauseI have even seenthe other post. Try being a bit carefulnext time. Anyway you have a contrasting character of not being able to solve a free fall problem and then talk about the formula whose understanding is beyond the scope of introductory physics.

7. Dec 9, 2005

### gunblaze

OMG.. I tot this was a kinematics problem..?!!>">!"?!">