2. Questions Bank
  3. 9th Class
  4. Science
  5. Time and Motion

9th Class Science Time and Motion Question Bank Motion

  • question_answer
    If\[x\] denotes displacement in time t and \[x\] = a cos cot, then for co = 1, the acceleration will be

    A) \[\text{a cos t}\]             

    B)        \[-\text{ a cos t}\]  

    C) \[\text{a sin t}\]             

    D)         \[-\text{ a sin t}\]

    Correct Answer: B

    Solution :

     \[S.H.M,\,\,x=a\cos \omega t\]and accelerations \[=-{{\omega }^{2}}x=-{{\omega }^{2}}a\cos \omega t\] Here\[\omega =1\], therefore acceleration\[=-\mathbf{acost}\]


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