Centripital Acceleration problem

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The discussion focuses on calculating centripetal acceleration using a rotational platform with specific parameters: a mass of 457 grams, a radius of 16 cm, and a time of 67.4 seconds for 100 rotations. The user seeks to find the velocity using the equation V=2π(r^2)/t * 100 and then use that velocity to calculate the force with F=mV^2/r. However, the calculated force does not match the expected counter force of 5.4 N. Participants are asked to provide assistance and show their attempts at solving the problem. The need for clarification on calculations and methodology is emphasized.
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Using a rotational platform I found the following values..
Mass of bob: 457 grams
Radius: 16 cm
time to make 100 rotations: 67.4 seconds
I need to find the velocity and was given the following equation V=2pi(r^2)/t *100
Once I find the velocity i need to plug that into the following equation to find force
F=mV^2/r

The counter force in the experiment was 5.4 N and i can't get anywhere near there. Can someone help me with this problem please.
 
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can you show your attempt at the problem?
 

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