You are riding your bike and steadily pulling your little brother Plus
in his red wagon while someone standing still watches you and
your little brother go by. He has a ball, and he throws the ball forward at a
velocity of 2.5 m/s relative to his body while you are pulling the wagon at a
velocity of 4.5 m/s. At what speed does the person who is standing nearby see
the ball go by?

the velocity at which the boy see the ball go by is 7ms-1

are there answer choices to this question? this seems like a question where you have options to choose from.

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )