a e O C D B ABlock A has an initial velocity upwards of 4 in/s and acceleration defined by al = 21, where acceleration is in units of in/s?, positive downwards. Block C starts from rest and moves downwards with constant acceleration of 3 in/s2. Find at / = 5 s, the acceleration, velocity, and change in position of block B (as, VB, and AVB, respectively). Indicate directions