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A 30 kg shell is flying at 48 m/s. When ...

A 30 kg shell is flying at 48 m/s. When it explodes, its one part of 18 kg stops, while the remaining part flies on with velocity

A

`120 ms ^-1``100 ms^-1`

B

`100 ms^-1`

C

`60 m s^-1`

D

`48 m s^-1`

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