What is the speed of other part just after explosion?

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A particle of mass 1 kg is thrown vertically upwards with speed 100 m/s. after 5 s, it explodes into two parts. One part of mass 400 g comes back with speed 25 m/s, What is the speed of other part just after explosion?
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Aug
A particle of mass 1 kg is thrown vertically upwards with speed 100 m/s. after 5 s, it explodes into two parts. One part of mass 400 g comes back with speed 25 m/s, What is the speed of other part just after explosion? A particle of mass 1 kg is thrown vertically upwards with [...]
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