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NTSE Sample Paper NTSE SAT Practice Test-10

  • question_answer
    A body of mass 2kg has initial velocity of 3 \[m{{s}^{-1}}\]along x-axis. It is subjected to a force of 4N in a direction perpendicular to x-axis. The displacement of the body after 4s is given by

    A) 12m                             

    B) 20m

    C) 28m                             

    D) 48m

    Correct Answer: B

    Solution :

    [b] Displacement along x-axis \[=4\times 3=12\]m Displacement along y-axis \[=\frac{1}{2}a{{t}^{2}}\] \[=\frac{1}{2}\left( \frac{4}{2} \right){{(4)}^{2}}\] =16m Resultant displacement \[=\sqrt{{{(12)}^{2}}+{{(16)}^{2}}}\] \[=\sqrt{144+256}\] =20m


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