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 the horizontal surface is 0.15. The minimum weight m1 should be put on top of m2 to stop the motion seen in the image below.
From FBD of mass m1
we get t=5g
to stop the motion T≤μ(m2 +m)g
=>5g≤0.15(10+m)g
=>m≥23.3kg
so the minimum mass that can stop motion is 23.3kg.
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