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12. Two particles of masses 1 kg and 3 kg move towards each other under their mutual force of attraction. No other force acts on them. When the relative velocity of approach of the two particles is 2m/s, their centre of mass has a velocity of 0.5 m/s. When the relative velocity of approach becomes 3 m/s, the velocity of the centre of mass is

(a)       0.5 m/s

(b)  0.75 m/s

(c)   1.25 m/s

(d)  Zero

Ans.a

(11)

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