1.

A projectile at its highest point, breaks into two equal parts due to an internal explosion. One part moves vertically up at 30 m/s with respect to ground. Then the other part will move with speed if (Speed just before explosion is 20 m/s) :

Answer»

`20m//s`
`10sqrt(3) m//s `
50 m/s
30 m/s

Solution :
` vecP_(1)=vecP_(f)`
`mxx20 hati= (m) /(2) xx30 HATJ+(m)/(2)XX VECV`
` vecv- 40hati- 30 hatj`
` | vecv | = 50`


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