Suppose a clay model of a koala bear has a mass of 0.250 kg and slides on ice at a speed of 0.700 m/s. It runs into another clay model, which is initially motionless and has a mass of 0.325 kg. Both being soft clay, they naturally stick together. What is their final velocity (in m/s)

The final velocity of the system is 0.304 m/s.

Explanation:

Given that,

Mass of the 1 clay model,

Mass of the second clay model,

Initial speed of the first clay model,

Initial speed of the second clay model, (at rest)

Both being soft clay, they naturally stick together. It is a case of inelastic collision. The momentum of the system remains conserved such that :

V is the final velocity of the system

So, the final velocity of the system is 0.304 m/s. Hence, this is the required solution.

they should be similar or the same

real, smaller and upside-down.   so the answer should be b.