Physics

Let's break down the problem step by step to determine the changes in momentum and kinetic energy.

 

Change in Momentum

The momentum of an object is given by:

 

where is the mass and is the velocity.

Initial velocity, (to the east).

Final velocity, (to the west, hence the negative sign).

Mass, .

 

Initial Momentum:

 

Final Momentum:

 

Change in Momentum:

 

Thus, the change in momentum is

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