In this scenario, we have a moving soccer ball with a force of 1.2 kN striking a stationary soccer ball. Based on the principles of momentum and collisions, we can analyze the possible outcomes.
When the moving soccer ball strikes the stationary one, the stationary ball will indeed begin to move in the direction that the first ball was traveling (downfield). As for the ball that was initially moving, it will typically lose some kinetic energy and slow down due to the transfer of momentum to the stationary ball.
Therefore, the correct response is:
The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.