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Question

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

A
Chemical energy Heat energy Kinetic energy
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B
Chemical energy Kinetic energy Heat energy
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C
Heat energy Kinetic energy Chemical energy
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D
Kinetic energy Chemical energy Heat energy
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Solution

The correct option is B Chemical energy Kinetic energy Heat energy
The man got energy by the digestion of glucose. Digestion of food is a chemical change. This energy is then transformed into kinetic energy as he pushes the block to move. As the block slides on a rough floor, it would eventually come to rest due to friction. Friction produces heat. So the correct order of energy change is:
Chemical energy Kinetic energy Heat energy.

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