A shell of mass m is at rest initially. It explodes into three fragments having mass in the ratio 2 : 2 : 1. If the fragments having equal mass fly off along mutually perpendicular directions with speed v , the speed of the third (lighter) fragment is

1. A. 2 v
2. B. 2 2 v
3. C. 3 2 v
4. D. v

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