In the following example, try to identify the number of times the velocity of the ball changes:
"$A$ football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team".
Also identify the agent supplying the force in each case.

(N/A) The velocity of the ball changes $4$ times.
$1$. The first player kicks the ball: The velocity changes from $0$ to a certain value. The agent is the first player.
$2$. The second player kicks the ball towards the goal: The direction changes, hence velocity changes. The agent is the second player.
$3$. The goalkeeper collects the ball: The ball comes to rest, so velocity changes from a certain value to $0$. The agent is the goalkeeper.
$4$. The goalkeeper kicks the ball to his teammate: The velocity changes from $0$ to a certain value. The agent is the goalkeeper.