A gymnast pushed down on a trampoline during a routine. What is the reaction force on the gymnast?
a) Friction pushes the gymnast forward across the trampoline.
b) Gravity pulls down on the gymnast.
c)Air resistance pushes back on the gymnast
d) The trampoline pushes back up on the gymnast.

d) The trampoline pushes back up on the gymnast.

Explanation:

According to Newton's third law of motion; for every action force, there is an equal and opposite reaction force. The action force and reaction force are reciprocal to one another i.e. they act oppositely to one another. The reaction force acts in an opposite direction to the action force and vice versa.

In this question, a gymnast pushed down on a trampoline during a routine. This is called the ACTION FORCE. In conformity to Newton's third law, the trampoline pushes back up on the gymnast. This opposite force is called the REACTION FORCE.

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it has to be b, about 97 percent.