"Elastic collisions" is a physics term meaning -- think of two identical steel (elastic) balls colliding
 

Since the collision is perfectly elastic, (9) tells us

So the identical balls come together with the same speed, v, and depart one another in the opposite directions with exactly the same velocities, v:

You can see the physics formula above is about "elastic collisions" which all just means -- the collision occurs (with adversity), but there's no permanent damage done to you (such as a pumpkin colliding with a baseball bat) and you keep your momentum going .  You aren't permanently damaged and you don't lost any speed getting to the goals and happiness of the rest of your life!

In her book, "Resilience: Elastic collisions with life's adversities" Susan Dunn explores our natural ability to meet transitions and even crisis with emotional intelligence.

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