Using unity Physic engine:
If I drop a ball from 100mt, how to calculate the time needed for it to touch the ground? (no drag etc…)
anyone with math skills ? 
distance = 1/2 × acceleration × time^2 + intial speed × time
Is the formula according to: How long did it take for the balls to hit the ground? The physical laws of gravitation
Sounds about right, though i’m a tad rusty.
Also see: falling object - Wolfram|Alpha
thx for the links…just one thing (I wish I could have studied more math in the past…)
The distance that an object travels under constant acceleration is given by the formula:
distance = 1/2 × acceleration × time^2 + intial speed × time
The initial speed is zero because the balls are dropped and not thrown. Therefore, we can solve for time:
time^2 = (2 × distance) / acceleration
How would the last formula be if initial acceleration were 20 ?
thx for the links!
very useful!
… That’s a b*(*.
http://www.wolframalpha.com/input/?i=d++%3D+1%2F2+×+g+×+t^2+%2B+s+×+t+for+t
Makes it easy 