Two blocks of masses \( M_{1}=4 \mathrm{~kg} \) and \( M_{2}=6 \mathrm{~kg} \) are connected by ...

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Two blocks of masses \( M_{1}=4 \mathrm{~kg} \) and \( M_{2}=6 \mathrm{~kg} \) are connected by a string of negligible mass passing over a frictionless pulley as shown in the figure below. The coefficient of friction between the block \( M_{1} \) and the horizontal surface is \( 0.4 \). When the system is released, the masses \( M_{1} \) and \( M_{2} \) start accelerating. What additional mass \( m \) should be placed over \( M_{1} \), so that the masses \( \left(M_{1}+m\right) \) slide with a uniform speed?
(a) \( 12 \mathrm{~kg} \)
(b) \( 11 \mathrm{~kg} \)
(c) \( 10 \mathrm{~kg} \)
(d) \( 15 \mathrm{~kg} \)
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