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I know how to use the non vertical equations for circular motion but i dont know which equation to use for this.

I can calculate the projectile motion after i have the velocity.

Mass = 2.5kg

CounterWeight Arm lenght = 16cm (ie. radius)

Circumpherence it travells = 1/3 of circle.

The counterweight arm only swings 1/3 of circles circumpherence.

All i need to know is the equation because i can use the non vertical motion equation but then i would have to guess the time it takes.

And i want to calculate the time not guess .))))