Question:
Two blocks of masses $10 \mathrm{~kg}$ and $20 \mathrm{~kg}$ moving at speeds of $10 \mathrm{~m} / \mathrm{s}$ and $20 \mathrm{~m} / \mathrm{s}$ respectively in opposite directions, approach each other and collide. If the collision is completely inelastic, find the thermal energy developed in the process.
Solution:
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