Question

The blocks A and B are arranged as shown in the figure. The pulley is frictionless. The mass of A is 10 kg. The coefficient of friction of A with the horizontal surface is 0.20. The minimum mass of B to start the motion will be

• A. 2 kg
• B. 0.2 kg
• C. 5 kg
• D. 10 kg

Answer 1

Answer: (A)

2 kg

Answer 2

$\mu = \frac { m _ { B } } { m _ { A } } \Rightarrow 0.2 = \frac { m _ { B } } { 10 } \Rightarrow m _ { B } = 2 \mathrm {~kg}$