Suppose a clay model of a koala bear has a mass of 0.235 kg and slides on ice at a speed of 0.720 m/s. It runs into another clay model, which is initially motionless and has a mass of 0.305 kg. Both being soft clay, they naturally stick together. What is their final velocity (in m/s)

The value is  

Explanation:

From the question we are told that

     The mass  of the first  model is  

      The sliding speed is  

       The mass of the second model is  

Generally from the law of momentum conservation w have that

Here is the velocity of the second model and given that it is  motionless at it initial state the value will be  

 So  

=>              

i think the answer would be reserve.