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A 0.149 kg glider is moving to the right on a frictionless, horizontal air track with...

A 0.149 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.900 m/s . It has a head-on collision with a 0.301 kg glider that is moving to the left with a speed of 2.18 m/s . Suppose the collision is elastic.
Part A
Find the magnitude of the final velocity of the 0.149 kg glider. Why can’t I use this equaton given to me by my professor: v1f=(m1-m2)/(m1+m2)*v1i?
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