If no external force acts on the system (a) acleleration of centre of mass is zero (b) Velocity of centre of mass is zero (c) Centre of mass may be at rest (or) moving with constant velocity (d) Velocity and momentum of centre of mass remains constant

If no external force acts on the system (a) acleleration of centre of

1.	If no external force acts on the system (a) acleleration of centre of mass is zero (b) Velocity of centre of mass is zero (c) Centre of mass may be at rest (or) moving with constant velocity (d) Velocity and momentum of centre of mass remains constant
Answer» a, B and C are TRUE a, c and d are true b, c and d are true a, b, c and d all are true Answer :B