Which mathematical expression for the centWhat should you do with the hanging mass right before starting the measurement? Group of answer choices Placing it in the center of the rotational platform. Removing it from the rotational platform. Attaching it to the brass object. Attaching it to the central post. ripetal force is correct? Group of answer choices Fc =42r2m/T Fc = mr2 Fc =mv/r Fc =42rm/T