Hi @RadoG
The initial velocity is the known velocity in the position that you have made the model. If you are dropping the model from 6 m above the floor, you can place the model 6 m above the floor and enter the known initial velocity (it's zero if you are dropping it.)
If you are throwing the model to the floor from 6 m away, then you know the velocity of the throw, and you enter that known velocity.
If you are positioning the model at a different location than the position of known velocity, then you need to use the equations for projectile motion. You can find these in many text books and websites. The main equation for a falling object in the direction of gravity is Vf^2 = Vi^2+2*g*s where
- Vi is the initial velocity
- g is the gravitational constant. (Be sure to use the proper sign for gravity, which is why you should review an article that gives the details for projectile motion.)
- s is the distance that the object falls
- Vf is the final velocity after the object falls a distance of s, starting with an initial velocity of Vi.
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