What is the conservation of mechanical energy is defined as? A. The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall, such as friction and air resistance

B. Energy of motion

C. Law of conservation of energy

D. Potential energy added to kinetic energy

A. The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall, such as friction and air resistance

Explanation:

Mechanical energy is of two forms; Kinetic energy and Potential energy.

These two forms of mechanical energy can be interconverted bete themselves. This means that potential energy can be transformed to kinetic energy and vice versa. During these transformations, the sum remains constant. This is known as the law of conservation of mechanical energy.

The law of conservation of mechanical energy is derived from the law of conservation of energy which states that, in a closed system, total energy is conserved—that is, it is constant. A closed system is one in which no energy is lost to the surroundings due to friction and air resistance.

Therefore, the law of conservation of mechanical can be stated as; The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall, such as friction and air resistance.

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

answer///carbon;