Question

Two masses of 20 kg and 10 kg are connected by
light string passing over a frictionless pulle
The coefficient of friction between 20 kg mass
and the table is 0.25. The minimum mass
required to the placed on 20 kg mass to prevent
from moving will be




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Answer 1

Equate frictional force and net pulling force(mass if 10 kg block x10)

This is the condition to avoide moving.