The body is thrown upward, giving it a kinetic energy of 300 J. At some altitude, the kinetic energy of the body will

The body is thrown upward, giving it a kinetic energy of 300 J. At some altitude, the kinetic energy of the body will decrease to 120 J. What will be the potential energy of the body at this height?

To find the potential energy of the thrown body at the considered height, we use the law of conservation of energy: Еk0 = Ek1 + Еп1, whence we express: Еп1 = Еk0 – Еk1.
The values of the variables: Еk0 – kinetic energy acquired at the moment of the throw (Еk0 = 300 J); Еk1 – kinetic energy at the considered height (Еk1 = 120 J).
Let’s perform the calculation: En1 = Ek0 – Ek1 = 300 – 120 = 180 J.
Answer: At the considered height, the potential energy of the thrown body will be 180 J.