1.

A body of mass 5 kg moves along X-axis with 2ms^(-1) A second body of mass 10 kg moves along y-axis with velocity sqrt3 ms^(-1). They collide at the origin and stick together. The velocity of the combined mass is :

Answer»

`(4)/(3) ms^(-1)`
`(8)/(3) ms^(-1)`
`(3)/(4) ms^(-1)`
`(3)/(8) ms^(-1)`

Solution :`p_(1)m_(1)u_(1)=10 kg ms^(-1)`
Similarly `p_(2)=m_(2)u_(2)=10sqrt3 kg ms^(-1)`
According to conservation of momnetum,
`(m_(1)+m_(2))V=20`
`implies v=(20)/(15)=(4)/(3) ms^(-1)`


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