Someone have asked me a question:

i was wondering if you can give an idea about how a bounce or elastic effect could be achieved in after effects.

This is quite simple effect which could be achieved using a simple expression like this:

inertia = 0.92;
i= 0.5;
start=rotation;
angle=90;

for (j=0; j<=time; j+=thisComp.frameDuration) {
target=thisComp.layer("plate").rotation.valueAtTime(j);
diff = (target-start);
angle = [angle*inertia + diff*i ]
start += angle;
}
start;

In the above example that expression is applied to a "Z rotation" property of a 3D layer

Download a sample project file to get better idea how it's done.