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(1) Let the masses of A and B be both M, the velocity of A when it first contacts B is v 1, and the velocity of * * * after it contacts B is v2. Taking A as the research object, from P to O, the functional relationship is μ GL = 12mv20? 12mv2 1

Taking A and B as the research objects, the collision torque is determined by the law of conservation of momentum.

mv 1=2mv2

V2= 12v20？ 2μgl

(2) After the collision, A and B move to the left from point O and return to point O, and let the maximum compression of the spring be X..

According to functional relationship:

μ(2mg)？ 2x= 12(2m)v22

Solution: x = v20 16μ g? l8。

Therefore, the maximum compression of the spring: X = V20 16μ g? l8。