Consider the following statements. Work is not done, when:1. a man is walking on a horizontal road.2. a man is climbing up a hill.3. a man with a load on his head is walking on a horizontal road.4. moon is revolving round the earth. Which of the statements given above are correct?

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Consider the following statements. Work is not done, when:<br />1. a man is walking on a horizontal road.<br />2. a man is climbing up a hill.<br />3. a man with a load on his head is walking on a horizontal road.<br />4. moon is revolving round the earth. Which of the statements given above are correct?