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A body of mass 1 kg, initially at rest explodes and breaks into three parts. The masses of the parts are in the ratio 1:1:3. The two pieces of equal mass fly off perpendicular to each other with speed of `30" m"//"s"` each. The velocity of the heavier part in m/s is

A

`10 sqrt2`

B

6

C

3

D

`6sqrt2`

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