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WB JEE Medical WB JEE Medical Solved Paper-2008

  • question_answer
    The distance travelled by an object along a straight line in time t is given by\[s=3-4t+5{{t}^{2}},\] the initial velocity of the object is

    A)  3 unit                   

    B)  - 3 unit

    C)  4 unit                                   

    D)  - 4 unit

    Correct Answer: D

    Solution :

       Given, distance travelled by an object along a straight line in time t is \[3-4t+5{{t}^{2}}\] Here, the velocity \[\frac{ds}{dt}=-4+10\,t\] Hence, initial velocity will be \[{{\left| u=\frac{ds}{dt} \right|}_{t=0}}=-4\,\text{unit}\]


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