A body of mass 50 kg is projected vertic...

A body of mass `50 kg` is projected vertically upward with velocity of `100 m//s`. After `5 s` this body breaks into `20 kg` and `30 kg`. If the `20 kg` piece travels upwards with `150 m//s`, then the velocity of other block will be

15m/sec downwards

15m/sec upwards

51m/sec downwards

51m/sec upwards

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