This is the 16171st most frequent Russian word.
ракеткой
"Ракеткой" means "with a racket" or "by means of a racket" in English.
In this sentence, 'ракеткой' is the instrumental case of the noun 'ракетка', describing the object used to perform the action of hitting.
Он ударил мяч ракеткой.
He hit the ball with the racket.
Here, 'ракеткой' is used with the instrumental case, indicating a method or tool that emphasizes the described action.
Он тренировался, держа ракеткой руку.
He trained by holding his racket hand steady.
In this example, 'ракеткой' illustrates an unconventional tool (the racket) used instrumentally for the purpose of painting.