Answer:
28 J, because mechanical energy is the sum of the potential energy and kinetic energy .
Explanation:
Mechanical energy is the combination of the kinetic and potential energy.
Kinetic energy is the energy that an object will have due to its motion.
Whenever an object's state or position is considered, it is called potential energy. For example, a bird sitting on top of a tree at some height is said to possess potential energy.
Whenever an object has velocity, it will have kinetic energy.
It is maximum when the potential energy is a minimum or zero, when total energy of an object or a system is conserved.
Similarly, whenever an object or a system has maximum potential energy, its kinetic energy is a minimum or zero.
