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im still nt clear how 2 gt the terminal velocity :/
Ops sorry I thought you meant how to make sure that it was the terminal velocity. =/ Sorry about that.
Continuing my previous reply, you basically measure the time taken for the ball to fall the distance AB by a stopwatch. This will allow you to identify the speed through the formula Distance/Time ---> Distance AB ( 5 cm ) / Time taken to fall through AB. How to know that this is the terminal velocity? You find the speed ( by the same procedure ) of the ball through the distance BC. If the speeds are equal, then there is no acceleration and the value of the speed is the terminal value. Read the previous reply again so that you get the whole image of what I'm trying to explain.
Hope this helps. : )