A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 1.4 of her regular weight.

Calculate the acceleration of the elevator, and find the direction of acceleration

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.