The velocity of the centre of mass of a two particle system is and total mass of particles is . The kinetic energy of the system 

a) 
May be equal to 
b) 
Must be equal to or less than 
c) 
May be equal to or greater than 
d) 
Can not be exactly calculated as the information given is insufficient 
The velocity of the centre of mass of a two particle system is and total mass of particles is . The kinetic energy of the system 

a) 
May be equal to 
b) 
Must be equal to or less than 
c) 
May be equal to or greater than 
d) 
Can not be exactly calculated as the information given is insufficient 
(a,c) As total mass is and velocity of centre of mass is hence KE of the system may have any value equal to or greater then . However exact value of KE can be calculated only when values of and are known to us. 