Discussion
Assertion (A): Pressed compacts sometimes crack during ejection rather than during pressing.
Reason (R): Elastic energy stored under load is released as the compact leaves the constraint of the die.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Under load the compact is elastically strained and the die holds it; as it is pushed clear the constraint is removed one section at a time and the stored energy is released as springback. If the compact relaxes faster than its weak green strength can accommodate, it laminates or cracks - which is why ejection is done slowly and why a tapered die exit helps.
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