Two particles of masses m1 and m2 in pro...

Two particles of masses `m_1 and m_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_2'` at time `2t_0` while still moving in air. The value of `|(m_1vecv_1' + m_2vecv_2') - (m_1vecv_1 + m_2vecv_2)|` is

`(m_1+m_2)gt_0`

`2(m_1+m_2)gt_0`

`frac(1)(2)(m_1+m_2)gt_0`

zero

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