Atennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 25.0 m/s and returns the shot with the ball traveling horizontally at 39.0 m/s in the opposite direction. (assume the initial direction of the ball is in the −x direction.

Idont understand the question

Indoraptor for sure

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

The independent variable in this experiment is the angle at which the light from the ray box strikes the mirror.hope this .