A device for training astronauts and jet fighter pilots is designed to rotate a trainee in a horizontal circle of radius 11.0 m. If the force felt by the trainee on her back is 7.25 times her own weight, how fast is she rotating

One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.