1.
when a basketball player jumps to make a shot,

the force with which he jumps is equal to the force with which he shoots the ball

the downward force on the floor is equal to the upward force on his feet

the forces on the player’s feet and on the floor are both in the upward direction

the action-reaction forces are unequal because they act on different objects

When a basketball player jumps to make a shot,

The downward force on the floor is equal to the upward force on his feet

Explanation:

According to Newton's Third Law of motion :

For every action there is equal and opposite reaction .

Hence when the  basketball player jumps to make a shot, The gravity (downward force) and his energy (upward force on his feet) exert equal forces on each other in opposite directions.