Stop and Reflect
In which of the following examples, the work done by a body is non-zero.
1. A man reading newspaper on a chair
2. A boy walking to his school
4. Boys playing football
3. A man pushing a wall
6. Girl singing a song,
5. A man holding a suitcase in his hand and
waiting at the bus stop
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girl singing a song .....
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Answer:
In 1 , 3,6 and 5
Explanation:
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