A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 320-g cart just after the collision?
A) 0.68 m/s
B) 0.11 m/s
C) 0.21 m/s
D) 1.4 m/s
E) 1.1 m/s
B
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