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  4. Two solid balls A and B whose masses are 200 g and 400 g respectively, are moving in mutually opposite directions. If the velocity A is 0.3ms- 1 and both the balls come to rest after collision, then the velocity of the ball B is

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Q. Two solid balls $A$ and $B$ whose masses are $200 \, g$ and $400 \, g$ respectively, are moving in mutually opposite directions. If the velocity $A$ is $0.3ms^{- 1}$ and both the balls come to rest after collision, then the velocity of the ball $B$ is

NTA AbhyasNTA Abhyas 2020

Solution:

From the conservation of linear momentum
Initial momentum = Final momentum
$200\left(0.3\right)+400v_{B}=0$
$v_{B}=-0.15 \, m \, s^{- 1}$