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.
J
jawwadbaig asked · 20 Oct 2012
how?
Community Comments (1)
F
faris92
4 Nov 2012
First is o find force acting towards gravity;
F=mg
2000x9.8
=19600
then find work with height 40m
W=force x distance
W=19600x40
=784000J or 784kJ
F=mg
2000x9.8
=19600
then find work with height 40m
W=force x distance
W=19600x40
=784000J or 784kJ
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