A conveyor belt is moving at a constant speed of  $2 \text{m }{\text{s}}^{-1}$.  A box is gently dropped on it. The coefficient of friction between them is  $\mu =\mathrm{0.5.}$  The distance that the box will move relative to belt before coming to rest on it taking  $g=10\mathrm{m}{\mathrm{s}}^{-2}$, is

• A

  $1.2 \mathrm{m}$
• B

  $0.6 \mathrm{m}$
• C

  Zero
• Correct answer
  D

  $0.4 \mathrm{m}$

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