Question

Three identical spheres, each of mass 1 kg are kept as shown in figure, touching each other, with their centres on a straight line. If their centres are market P, Q, R respectively, the distance of centre of mass of the system from P is:

• A. $\frac { P Q + P R + Q R } { 3 }$
• B. $\frac { P Q + P R } { 3 }$
• C. $\frac { P Q + Q R } { 3 }$
• D. $\frac { P R + Q R } { 3 }$

Answer 1

Answer: (B)

$\frac { P Q + P R } { 3 }$

Answer 2