Question 2 10 pts Computation. Mounted for repair, a 3.9-kg bicycle tire has a radius of 45 cm. It rotates through an angle of 26.9 rad as it slows uniformly from 20.6 rad/s to 18.6 rad/s. Find the magnitude of its angular acceleration. a = rad/$2 Record your numerical answer below, assuming three significant figures. Remember to include a "- " as necessary