Answer :
The speed of the 6.00 kg object after the collision is 1.67 m/
Initially the 4 kg object was moving at 5.00 m/s in the east direction, and the 6 kg object was at rest.
The 4 kg object collided elastically with the 6 kg object, and after the collision, the 4 kg object started moving in the southwest direction.
Therefore, there are two components of velocity of the 4 kg object, one in the east direction and the other in the south direction, with the resultant velocity of the object being in the southwest direction.
Therefore, the speed of the 6 kg object after the collision is simply the magnitude of its velocity, which is 3.33 m/s in the east direction. Thus, the speed of the 6.00 kg object after the collision is 1.67 m/s.
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