The gravitational potential energy of an object is always measured relative to the question 5 options: surface of earth. position of maximum mechanical energy. location where the object's kinetic energy is zero. reference level from which the height is measured.

the assumption is usually made that the zero of gravitational potential energy is the surface of the earth and that the potential energy is proportional to the height above the earth's surface. This is an approximation which is only valid near the surface of the earth, but is fine for baseballs and other common applications of gravitational potential energy. If you are in a room, it is logical to just call the floor the zero of gravitational potential energy, and measure the energy of an elevated object with respect to the floor.

the millers tale is the answer.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.