A person lifts a school bag of 20 kg from the ground level and puts it on his shoulder at 1 m above ground level calculate the work done by on the bag
Answers
Explanation:
Solution :
The kinetic energy of the suitcase was zero when it is was at the platform and it aain became zero when it was put on the head. The change in kinetic energy is zero and hence the total work done on the suitcase is zero. Two forces act on the suitcase, one due to gravity and the other due to the porter. Thus, the work done by the porter is negative of the work done by gravity. As the suitcase is lifted up,the work done by gravity is
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. The work done by the porter is 392 J =390 J.
Answer:
The work done by the porter is 392 J =390 J.
Explanation:
The kinetic energy of the suitcase was zero when it is was at the platform and it aain became zero when it was put on the head. The change in kinetic energy is zero and hence the total work done on the suitcase is zero. Two forces act on the suitcase, one due to gravity and the other due to the porter. Thus, the work done by the porter is negative of the work done by gravity. As the suitcase is lifted up,the work done by gravity is