The work done in lifting a mass of 2000 kg vertically to a height of 40 metres is
- 392.4 kJ.
- 784.8 kJ.
- 196.2 kJ.
Explanation
Work against gravity is mgh = 2000 kg x 9.81 m/s squared x 40 m = 784,800 J = 784.8 kJ. The 392.4 kJ distractor comes from omitting a factor or using half the height, but the full mass and height apply here.
romeshkunder asking:
please explain
Community Comments (1)
R
rajib Posts: 8 29.08.2013 / 12:44
you might be missing out 'g'.
usee W.D = mgh
further details
http://www.school-for-champions.com/science/gravity_work_against_gravity.htm
usee W.D = mgh
further details
http://www.school-for-champions.com/science/gravity_work_against_gravity.htm
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