The mechanical energy of an object is equivalent to the sum of its potential and kinetic energy. If the helicopter is grounded, then its mechanical energy will be 20 J. If it is in the air, then its potential energy will be calculated using:P.E = mghAnd then added to the kinetic energy to obtain mechanical energy.
<span>I think the correct answer from the choices listed above is option A. Having to do all the work is an example of h</span>aving to do all the work is an example of an a<span>dvantage to Society of using Authority. Hope this answers the question. Have a nice day.</span>
