Question

an object moves up an inclined plane. friction and air resistance can be ignored. which of the following statements is true? multiple choice kinetic, potential, and mechanical energy all decrease. kinetic energy decreases, potential energy increases, and mechanical energy is constant. kinetic energy decreases, potential energy is constant, and mechanical energy decreases.

Explanation:

When an object moves up an inclined plane (no friction/air resistance), mechanical energy (sum of kinetic and potential) is conserved (constant) as no non - conservative forces act. Kinetic energy ($KE=\frac{1}{2}mv^{2}$) decreases as speed reduces (object slows down moving up). Gravitational potential energy ($PE = mgh$) increases as height ($h$) increases. So the correct statement is the second option.

Answer:

B. Kinetic energy decreases, potential energy increases, and mechanical energy is constant.