1.

Two particles of masses m_(1) andm_(2) in projectile motion have velocities vecv_(1) and vecv_(2) respectively at time t= 0. They collide at time t_(0). Their velocities become vecv_(1) and vecv_(1) at time 2t_(0) while still moving in air. The value of |(m_(1)vecv_(1)^(1)+m_(2)vecv_(2)^(1))-(m_(1)vecv_(1)+m_(2)vecv_(2))| is

Answer»

ZERO
`(m_(1)+m_(2))g t_(0)`
`2(m_(1)+m_(2))g t_(0)`
`(1)/(2)(m_(1)+m_(2))g t_(0)`

Solution :`mv^(1)=m(u+at)`
`m_(1)v_(1)^(1)+m_(2)v_(2)^(1)=m[v_(1)+2g t_(0)]+m[v_(2)+2g t_(0)]`


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