physics troubles?

An 83.5 kg fullback moving east with a speed of 6.0 m/s is tackled by a 90.0 kg opponent running west at 2.80 m/s, and the collision is perfectly inelastic.

Calculate the velocity of the players just after the tackle.

Calculate the decrease in kinetic energy during the collision.

I have gotten some answers but the program i am using keeps telling me my answer it wrong

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