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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    A body of mass 3 kg is under a constant force which causes a displacement s in meter in it, given by the relation \[s=\frac{1}{3}{{t}^{2}},\] where t is in second. Work done by the force in 2 second is

    A) \[\frac{3}{8}J\]             

    B)        \[\frac{8}{3}J\]

    C) \[\frac{19}{5}J\]           

    D)        \[\frac{5}{19}J\]

    Correct Answer: B

    Solution :

    [b]  Acceleration\[=\frac{{{d}^{2}}s}{d{{t}^{2}}}=\frac{2}{3}m/{{s}^{2}}\] Force acting on the body \[=2\times 2=4\,cm\] Displacement in 2 sec\[=\frac{1}{3}\times 2\times 2=\frac{4}{3}m\] Work done\[2\times \frac{4}{3}=\frac{8}{3}J\]


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