Laws of Motion 3 Question 4

4. Two masses m1=5kg and m2=10kg 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

(2018 Main)

(a) 23.33kg

(b) 18.3kg

(c) 27.3kg

(d) 43.3kg

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Answer:

Correct Answer: 4. (a)

Solution:

  1. None of the four options are correct.

Substituting, m1=5kg and m2=10kg

We get, μ(10+m)g5g10+m50.15

m23.33kg



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