Kinetic energy is energy of motion. Anything that's moving has it.
Anything that's not moving doesn't have it.
The only thing on this list of choices that's moving is the gymnast
doing a cartwheel. The swimmer, the basketball player, and the
horse are all just sitting or standing there.
Magnitude of acceleration = (change in speed) / (time for the change) .
Change in speed = (ending speed) - (starting speed)
= zero - (43 m/s)
= -43 m/s .
Magnitude of acceleration = (-43 m/sec) / (0.28 sec)
= (-43 / 0.28) (m/sec) / sec
= 153.57... m/s²
= 1.5... x 10² m/s² .
