Stationary mass $m _ { 2 }$ is involved in an elastic, one-dimensional collision with mass $m _ { 1 }$. If $m _ { 1 }$ had an initial velocity three times greater than (and in the same direction as) the final velocity of $m _ { 2 }$, the mass of $m _ { 2 }$ is
A) 3 $m _ { 1 }$
B) 4 $m _ { 1 }$
C) 6 $m _ { 1 }$
D) 5 $m _ { 1 }$

Question

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The Answer of Stationary mass $m _ { 2 }$ is involved in an elastic, one-dimensional collision with mass $m _ { 1 }$. If $m _ { 1 }$ had an initial velocity three times greater than (and in the same direction as) the final velocity of $m _ { 2 }$, the mass of $m _ { 2 }$ is
A) 3 $m _ { 1 }$
B) 4 $m _ { 1 }$
C) 6 $m _ { 1 }$
D) 5 $m _ { 1 }$

Stationary Mass m2m _ { 2 }m2​ Is Involved in an Elastic, One-Dimensional Collision with Mass

Stationary Mass $m _ { 2 }$ Is Involved in an Elastic, One-Dimensional Collision with Mass