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A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be

(g=10\, \, ms^{-2})

  • Option 1)

    6 ×103 J

  • Option 2)

    6 J

  • Option 3)

    0.6 J

  • Option 4)

    zero

 

Answers (1)

best_answer

As we discussed in concept

Zero Work -

\Theta = \frac{\pi }{2}

- wherein

Force and  displacement vectors are Perpendicular to each other

 

 W=fs\:\cos 90^{\circ}

W=0


Option 1)

6 ×103 J

Option is incorrect

Option 2)

6 J

Option is incorrect

Option 3)

0.6 J

Option is incorrect

Option 4)

zero

Option is correct

Posted by

Aadil

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