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radioactive particle at rest, having mass 10g, breaks into 2 fragments (1&2) in the mass ratio 2:3 respectively. If the first one moves with a velocity of 10m/s what will be the speed of the second particle?

a) 4.33 m/s

b) -4.33 m/s

c) -6.67 m/s

d) 6.67 m/s

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