Question

A body is thrown up with a kinetic energy of 100J . Find the potential energy at the topmost point

Answer 1

Answer:

ke =100j

pe at the topmost point is also 100j because energy never changes

decrease in ke=increase in pe.

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Explanation:

Answer 2

By law of conservation of mechanical energy, the potential energy of the body at the topmost point is numerically equal to the kinetic energy of the body at the bottom.

What law of conservation of mechanical energy says is that, the total mechanical energy of a body remains constant or the mechanical energy can be converted from one form into another.

Well, the total energy of a body is the sum of its kinetic energy and potential energy.

At the ground or bottom point where the body is projected, it has no potential energy since there's no height, thus kinetic energy is maximum there. Hence total energy is numerically equal to the maximum kinetic energy → (1)

At the topmost point, since it has no velocity, the body has no kinetic energy, hence potential energy is maximum there. Hence total energy is numerically equal to maximum potential energy → (2)

From the statements (1) and (2), we can say that maximum kinetic energy is numerically equal to maximum potential energy. Thus the potential energy of the body at the topmost point is also 100J.