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Work Energy and...

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  • Question 1
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    Find out work done by applied force to slowly extend the spring from x to 2x.

  • Question 2
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    How fast should a girl of 40 kg run so that her kinetic energy is 320J?

  • Question 3
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    How much work should be done on a car of mass 1000 kg to increase its speed from 10 m/s to 20 m/s (Ignore air resistance and friction).

  • Question 4
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    Which one of the following possesses both kinetic and potential energies?

  • Question 5
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    An object of mass 500 g falls from a height of 2m. If $${g = 9.8 m/s^2}$$, what is its kinetic energy just before touching the ground?

  • Question 6
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    A wound watch spring has ______ energy.

  • Question 7
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    If the speed of a motor car becomes six times, then the kinetic energy becomes

  • Question 8
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    The spring of the winding knob of a watch has

  • Question 9
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    You lift a suitcase from the floor and keep it on the table. The work done by you on the suitcase depends on

  • Question 10
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    The work done in lifting 1 kg mass to a height of 9.8 m is about

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