A 2.3 kg object traveling 6.1 m/s to the right collides head on with a 3.5 kg object initially at rest. If the collision is perfectly elastic, what is the final speed and direction of the 2.3 kg object?
a) 1.3 m/s left
b) 1.3 m/s right
c) 4.8 m/s left
d) 4.8 m/s right