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COMEDK2017PhysicsWork, Power and Energy

The relationship between the force F and position x of a body is as shown in the figure. The work done in displacing the body from x=1 ~m to x=5 ~m will be

Options

  1. A30 J
  2. B15 ~J
  3. C25 ~J
  4. D20 ~J

Correct answer

B. 15 ~J

Step-by-step solution

The work done in a F-x graph is calculated by the area under the graph. The given graph can be shown as Work done in displacing the object from x=1 ~m to x=5 ~m will be aligned W &= area under F-x graph =& area A B J K+ areaCLDJ & + area D G F E+ area G H I =&(10 1)+(5 1)+(-5 1)+ ( 1 2 1 10 ) =& 10+5-5+5=15 ~J aligned

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