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NEET 2024 · Collisions

Collisions question from NEET 2024

Q1NEET 2024Easy

Collisions

An object falls from a height of $10\text{ m}$ above the ground. After striking the ground it loses $50\%$ of its kinetic energy. The height upto which the object can rebound from the ground is:

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Answer: (d)

KE just before impact $= mgh = mg(10)$ .
After losing 50%, KE $= \frac{1}{2}mg(10) = mg(5)$
This KE lifts it to $h' = 5\text{ m}$
So the answer is (d) 5 m.

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