Glider problem?

A glider of mass 0.152 kg is moving to the right on a frictionless, horizontal air track with a speed of 0.820 m/s. It has a head-on collision with a glider 0.298 kg that is moving to the left with a speed of 2.25 m/s. Suppose the collision is elastic. Find the magnitude of the final velocity of the 0.152 kg... show more A glider of mass 0.152 kg is moving to the right on a frictionless, horizontal air track with a speed of 0.820 m/s. It has a head-on collision with a glider 0.298 kg that is moving to the left with a speed of 2.25 m/s. Suppose the collision is elastic.

Find the magnitude of the final velocity of the 0.152 kg glider.

Find the magnitude of the final velocity of the 0.298 kg glider.
Update: okay so i used this formula :

v1f=((m1-m2)/(m1+m2))v1i +((2m2)/(m1+m2)v2i
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