Question

find the coordinates of the centre of mass of a system of 4 particles as located in y,z plane​

Answer 1

The coordinate of centre of mass:

Let m1=20g  y1=3; z1=0;

  m2=50g;  y2=8; z2=0;

   m3=70g; y3=3; z3=4;

   m4=60g;  y4=8;  z4=4;

The centre of mass along y=  m1×y1 +m2×y2 +m3×y3+ m4×y4÷(m1+m2+m3+m4)

=  (60+400+480+210)÷200

= 5.75 cm

The centre of mass along z=(m1×z1+ m2×z2+ m3×z3+ m4×z4)÷m1+m2+m3+m4

                                =0+0+280+240÷(200)

                             =2.6