Question

Two masses m₁ = 5 kg and m₂ =10 kg connected by an inextensible string over a frictionless pulley, are moving as shown in the figure. The coefficient of friction of horizontal surface is 0.15. The minimum weight  m that should be put on top of m₂ to stop the motion is

(a) 18.3 kg

(b) 27.3 kg

(c) 43.3 kg

(d) 10.3 kg

Answer 1

Correct option (b) 27.3 kg

Explanation:

Motion stops when pull due to m₁ ≤ force of friction between m and m₂ and surface.