question_answer

A molecule of oxygen moving with a speed of 200 m/s collides elastically with another oxygen molecule at rest. After the collision, if one moves at an angle of \[42{}^\circ \] from the initial line, the other molecule will move at an angle on the other side of the initial line by

A) \[42{}^\circ \]                                   

B) \[138{}^\circ \]

C) \[48{}^\circ \]

D)  cannot be found