A projectile of mass 30 kg is shot vertically upwards with an intial velocity of 10 m/s.After 5 s, it explodes into two fragments, one of which having a mass of 20 kg is travelling vertically with a velocity of 150m/s. What is the velocity of the other fragment at that instant?

A projectile of mass 30 kg is shot vertically upwards with an intial v

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1.	A projectile of mass 30 kg is shot vertically upwards with an intial velocity of 10 m/s.After 5 s, it explodes into two fragments, one of which having a mass of 20 kg is travelling vertically with a velocity of 150m/s. What is the velocity of the other fragment at that instant?
Answer» `-15 m//s` 15 m/s zero None of these Solution :Velocity of the body after 5 s `V=u-gr=100-9.x5=51 m//s` The projectie explodes into TWO FRAGMENTS of masses 20kg and 30 kg APPLYING LAW ofconservationof linear momentum `20x150+30xV=(20+30)v` or `3000+30V=50x51` `or 30v=2550-3000` `V=(-450)/(30)15m//s`