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The behaviour of a body under zero resul...

The behaviour of a body under zero resultant force is given by .

A

first law of motion

B

second law of motion

C

third law of motion

D

law of gravitation

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The correct Answer is:
A
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Knowledge Check

  • Two forces, with equal magnitude F, act on a body and the magnitude of the resultant force is F/3 . The angle between the two forces is:

    A
    `cos^(-1)(-17/18)`
    B
    `cos^(-1)(-1/3)`
    C
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    D
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  • Two forces with equal magnitudes F act on a body and the magnitude of the resultant force is F /3. The angle between the two forces is

    A
    `cos^(-1)(-(17)/(18))`
    B
    `cos^(-1)(-(1)/(3))`
    C
    `cos^(-1)((2)/(3))`
    D
    `cos^(-1)((8)/(9))`

  • Assertion : The forces acting on a body can be replaced by the resultant force only as regards the motion of the body as a whole. Reason : The resultant force can not replace the several forces acting on a body in other respects.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
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    D
    If assertion is false but reason is true.

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