Final answer:
The force exerted by the ball on the racket is 84 N to the West, according to Newton's Third Law, as it is equal and opposite to the force exerted on the ball.
Step-by-step explanation:
The force exerted by the tennis ball on the racket can be determined using Newton's Third Law, which states that for every action, there is an equal and opposite reaction. Therefore, the magnitude of the force exerted by the ball on the racket during the collision is equal to the force exerted by the racket on the ball, and it is in the opposite direction. In this scenario, since the tennis ball experiences a force of 84 N to the East, the racket experiences a force of 84 N to the West. Newton's Third Law is exemplified by this force interaction between the tennis ball and the racket.