Question

a man jumps off of a paddle board into a lake as shown below. if the mans feet pushing the paddle board is the action force, then which of the following is the reaction force?
a. the paddle board pushing down on the water
b. water pushing up on the paddle board
c. water pushing up on the mans feet
d. the paddle board pushing back on the mans feet

Explanation:

According to Newton's third - law of motion, for every action, there is an equal and opposite reaction. The action force is the man's feet pushing the paddle board. The reaction force is the paddle board pushing back on the man's feet, as these two forces act on two different objects (man and paddle board) and are equal in magnitude and opposite in direction.

Answer:

D. the paddle board pushing back on the man's feet