Two masses `A` and `B` of `10 kg` and `5 kg`, respectively , are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown. The coefficient of static friction between `A` and the table is `0.2`. The minimum mass `C` that should be placed on `A` to prevent it from moving is equal to

Answer

15

Explanation

For limiting condition `mu = (m_(B))/(m_(A) + m_(C )) implies 0.2 = (5)/(10 + m_(c )) implies 2 + 0.2 m_(c ) = 5 implies m_(c ) = 15 kg`