There is a compass (drawing kind) with both points touching a piece of paper. The length of the arms is 15cm. The theta between the arms is 60deg. Each arm is moving toward the center at .030m/s. The question asks me to calculate the velocity of the joint as a function of time and give the velocity of the joint when the arms start closing. I can’t seem to figure a way to translate the velocity at which the arms are moving toward center to the Y direction where the joint is moving upward as the arms close. I know there has to be some sort of trig ratio I can apply to scale the velocity (in the X direction) to the joint’s velocity (Y direction). Any thoughts?