A block of \( 10 \mathrm{~kg} \) mass is thrown on a rough surface having friction coefficient \...

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A block of \( 10 \mathrm{~kg} \) mass is thrown on a rough surface having friction coefficient \( 0.3 \) with an initial speed of \( 5 \mathrm{~m} / \mathrm{s} \). Find the P amount by which the internal energy of the block and the surface will increase. If this block is seen from a frame moving at a speed of \( 5 \mathrm{~m} / \mathrm{s} \) in the direction of its velocity then it is observed that the block is gently put on the rough surface moving in opposite direction at speed \( 5 \mathrm{~m} / \mathrm{s} \). Find the gain in kinetic energy of the block as seen from this frame.
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