What was the speed of the clay as it hit the glider?

Question

The glider on an air track has a mass of 1.00 kg and floats on compressed air, so it can move frictionlessly. Someone shoots a 15.0 g lump of clay at it. The clay strikes the glider, sticks to it, and both move away with a speed of 22.0 cm/s. What was the speed of the clay as it hit the glider?

_____ m/s

Impulse and Momentum
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Answer 1

Use conservation of momentum
1000 x 0+15 x v=(1000 +15) x 22 and solve for v and covert to meters