Final answer:
A 100kg object suspended motionlessly at 30 meters above the ground has zero kinetic energy because it has no motion.
Step-by-step explanation:
The subject of this question is the kinetic energy of an object, which falls under the domain of Physics.
A 100kg object that is suspended motionless at 30 meters above the ground has zero kinetic energy because it is not moving.
Kinetic energy is defined as the energy an object possesses due to its motion and is given by the equation KE = 1/2 mv², where m is mass and v is velocity.
Since the velocity (v) of the suspended object is 0 m/s, its kinetic energy is also 0 J (Joules).