# Velocity from using only weight mass and kilogram force?

1. Apr 20, 2013

### pisola

i was wondering about counting velocity only from weight mass and from kilogram force (like force from rocket thruster)

ex: there's a rocket in space, its weight is 63 metric tons and the rocket thruster output is 128 tons. i won't include the G force, cause i wanna look the velocity when it's in space.

is there a formula to count velocity from that kind of category? of course the velocity would be km/h

to make it simple for the kilogram force, i try to convert 128 tons force to newton, which is 125,5251.2 newton

2. Apr 20, 2013

### SteamKing

Staff Emeritus
F = ma everywhere

3. Apr 20, 2013

### pisola

um, can you explain...?

i'm a little idiot to physics, so can you please explain step by step how can get that formula to fit the description above...?

4. Apr 20, 2013

### sophiecentaur

Force in Newtons, Mass in kilograms and acceleration in metres per second squared.
The velocity will depend on how long the force has been applied. V = at

BTW kilogram or a tonne is not a force. A force is measured in Newtons in SI units.
What do you actually want to know and what do you mean by "count velocity"?