How do I change speed...

hello in my app i have faling objects created very 2 seconds, but i would like to make this,

every second, the falling speed accelerate how to do that?

that is the "behavior" of faling objects ?

i use platform behaviour for my falling objects

you mean like this........

well i don't really see the speed changing, i mean, when the game start the falling speed is slower, and it accelerate each second to finally reach an extreme speed for ex when the score reach 100

If someone can help with this, i need to make a progressive falling speed from "slow" to " impossible"

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thanks Korbaach