A 15 g toy car moving to the right at 24 cm/s has a head-on nearly elastic collision with a 21 g toy car moving in the opposite direction at 31 cm/s. After colliding, the 15 g car moves with a velocity of 41 cm/s to the left. Find the speed of the second car after the collision.

The speed of the second toy car after collision is

Explanation:

Let movement to the right be positive and the opposite negative

From the question we are told that

   The mass of the car is  

    The initial velocity of the car is  

    The mass of the second toy car  

    The initial velocity of the car is

    The final velocity of the first car is  

     From law of momentum conservation we have that

substituting values

gets less

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