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Answer:
The velocity of the ball relative the racquet is 15 m/s.
Step-by-step explanation:
Given;
velocity of the tennis ball, = 30 m/s
Velocity of the racquet swung in opposite direction, = 15 m/s
The velocity of the ball relative the racquet () is calculated as;
Therefore, the velocity of the ball relative the racquet is 15 m/s.