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 in Fig. 15.4.1. The co-efficient of friction of A with the table is 0.2 The minimum mass of C that may by placed on A to prevent it from moving is equal to

Options

A. 15 kg
B. 10 kg
C. 5 kg
D. 20 kg

Answer

A

Explanation

(a) ` mu (m_(A)+m_(C))g=m_(B)g`
`therefore" " m_(C)=(m_(B))/(mu)=m_(A)=(5)/(0.2)-10=15 kg`