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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a