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9th Class Science Time and Motion Question Bank Motion

  • question_answer
    A particle is pushed along a horizontal surface in such a way that it starts with a velocity of\[12\,\,m\,\,{{s}^{-1}}\], and decreases at the rate of\[0.5\,\,m\,\,{{s}^{-2}}\]. Find the time it will take to come to rest.

    A) \[6s\]    

    B)                    \[12s\]

    C) \[24s\]                

    D)        \[48s\]

    Correct Answer: C

    Solution :

     \[u=12\,\,m\,\,{{s}^{-1}};\,\,v=0;\,\,a=-0.5\,\,m\,\,{{s}^{-2}}\]\[v=u+at\] \[0=12-0.5\times t,\,\,0.5t=12,\,\,t=\frac{12}{0.5}=24\,\,s\]


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