Answer:
The velocity of
ball changes three times.
(a)The velocity
changes for the first time, when the ball is kicked by football player of one
team. So he is the agent who supplies the force in this case.
(b) The
velocity changes for the second time, when the ball is kicked by another player
of same team who naturally becomes the agent supplying force in this case.
(c) The
velocity changes for the third time, when the ball is kicked by goalkeeper of
the opposite team towards a player of his own team. Thus, the agent supplying
the force in this case is the goalkeeper.
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