To generate natural energy that's cheaper and more reliable
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.
Answer:
D
Explanation:
because in it its talking about protecting and stuff... im dumb X-X
The correct answers are:
(B) Poverty for most Russians
(C) Food shortages
(D) The writing of Karl Marx
