A man eats glucose and makes a block move, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

chemical - heat - kinetic

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chemical - kinetic - heat

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heat - kinetic - chemical

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Solution

The correct option is B
chemical - kinetic - heat

The man eats glucose, which was broken down in the body to give him the energy to push the block. The form of energy from glucose is chemical energy and the form energy that it gets converted to is kinetic energy. Moving block comes to rest due to friction, and in that process, energy in the block is lost as 'heat'. Hence the conversion is from kinetic energy to heat energy

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