Question

One 3.0 kg paint bucket is hanging by a massless cord from another 3.0 kg paint bucket, also hanging by a massless cord(a) If the buckets are at rest, what is the tension in each cord (upper and lower)?(b) If the two buckets are pulled upward with an acceleration of 1.80 m/s2 by the upper cord, calculate the tension in each cord( upper and lower).