Question

Block A has a mass of 2 kg and block B has a mass of 20 kg. If the coefficient of kinetic friction between block B and the horizontal surface is 0.1 and B is accelerating towards the right with $a=2m/s^2$, then the mass of the block C will be

• A. 15 kg
• B. 12.5 kg
• C. 5.7 kg
• D. 10.5 kg

Answer 1

The correct option is D 10.5 kg

$mg2g\mu \times 20\times g=(m+22)\times 2$
$\Rightarrow m=10.5kg$.