Q162 / 180 · COMEDK 2015 · Physics

A $2 \mathrm{~kg}$ mass lying on a table is displaced in the horizontal direction through $50 \mathrm{~cm}$. The work done by the normal reaction will be

  • A
    $10 \mathrm{~J}$
  • Correct answer
    B
    0
  • C
    $100 \mathrm{erg}$
  • D
    $100 \mathrm{~J}$

Solution

Since, displacement on the body of mass $2 \mathrm{~kg}$ is in the horizontal direction while normal reaction acts on the body in perpendicular to the displacement. Hence, $\quad \theta=0$ $\therefore$ Work done, $W=F s \cos 90^{\circ}=0$

Hence, the correct answer is option: 'B'.

More Work Power Energy Questions