Button reset

Hello every1,

I have button triggered on key, that button calculates the force of the kicking ball(1-100). When I press event trigger key(space) powerbar is filling up, and after that ball is moving for calculated force, depended on powebar number. But when I continue hitting space, ball just continues moving based on last powerbar number. How I make my button resets, and ball movement at the same time aswell, so when I hit space powerbar should fill again, and make ball move again but by different force(depended on power bar ofcourse), so not remembering the last number, just reading the new one. Hope u understood me.

 

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