Answer:
Final velocity will be equal to 0.321 m/sec
Explanation:
We have given mass of clay model of lion 
Its speed is 0.85 m/sec, so 
Mass of another clay model 
It is given that second clay is motionless
So its velocity 
Now according to conservation of momentum
Momentum before collision will be equal to momentum after collision
So
, here v is velocity after collision
So 

v = 0.321 m/sec
So final velocity will be equal to 0.321 m/sec