One 2.9 kg paint bucket is hanging by a massless cord from another 2.9 kg paint bucket, also hanging by a massless cord. (a) If the buckets are at rest, what is the tension in each cord (lower and upper)? (b) If the two buckets are pulled upward with an acceleration of 1.90 m/s2 by the upper cord, calculate the tension in each cord(lower and upper)?