A helium atom (m = 6.6465 x 10-27 kg) collides elastically with an oxygen atom (m = 2.6560 x 10-26 kg) at rest. After the collision, the helium atom is observed to be moving with a velocity of 6.636 x 106 m/s in a direction at an angle of 84.7 relative to its original direction. The oxygen atom is observed to move at an angle of -40.4 Find the speed of the oxygen atom

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