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2. Physics

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 from PART66Online

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.

R

romeshkunder asked · 28 Aug 2013

please explain

Community Comments (1)

R
rajib 29 Aug 2013
you might be missing out 'g'.
usee W.D = mgh



further details

school-for-champions.com/science/grav...

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