A UHart Mechanisms Enthusiast Club is using a rigid bar (length LAB = 18 in.) with wheels riding along horizontal and sloped (angle theta = 45°)surfaces to demonstrate rigid body

acceleration.Point B is measured with video analysis software at the instant shown (ß = 30°) to be traveling at Vb = 20 in/s to the right while slowing down at ab = 5 in/s².