Well, the easiest way (assuming you already have gravity set up) is to make it so that it only falls if it's not touching the color that the platform is. A script might look like this:
when green flag clicked Forever If <not <touching color (whichever)> > Change y by -5
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i always use <if><touching color[ green ]>
<set{ gravity }to( 0 )>
<else><change{ gravity }by( 0.2 )
<end>
and at the end of the script say: change y by gravity.
that's what i use. it makes the character accelerate as he falls.
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