# Answer to Question #66178 in Mechanics | Relativity for suraj mali

Question #66178

The position vector of two particles of mass 4.0 kg and 2.0 kg are, respectively,

r 3 �i �j 2 k� 2

1 = t + t + t

r

and r 3�i ( 1)�j 4 k� 2

2 = + t - + t

r

where t is in seconds and the position

in metres. Determine the position vector of the centre of mass of the system, the

velocity of the cm and the net force acting on the system.

r 3 �i �j 2 k� 2

1 = t + t + t

r

and r 3�i ( 1)�j 4 k� 2

2 = + t - + t

r

where t is in seconds and the position

in metres. Determine the position vector of the centre of mass of the system, the

velocity of the cm and the net force acting on the system.

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