each of the following parts of the question by choosing the correct answer A) A girl rides an escalator that moves her upward at constant speed. As the girl rises, how do her gravitational and kinetic energy change? i) Gravitational potential energy decreases and kinetic energy decreases ii) Gravitational potential energy decreases and kinetic energy remains the same. iii) Gravitational potential energy and kinetic energy decreases iv) Gravitational potential energy increases and kinetic energy remains the same B) If the speed of a moving object is doubled, which quantity with the object must also double? I) Momentum ii) Kinetic Energy iii) Acceleration iv) Gravitational potentional energy C) The elastic potential energy for an ideal Spring is: I) Always negative ii) Always positive iii) Depends if the Spring is compressed or streched iv) Depends if the Spring is doing the work or the work is done on the Spring