CASE STUDY SECTION - E $(2\pi 4=8)$ Read the case study given below and answer the questions: 34. Potential energy is the energy stored within an object, due to the object's position, arrangement or state. Potential energy is one of the two main forms of mechanical energy, along with kinetic energy. Potential energy depends on the force acting on the two objects.

1. A body is falling freely under the action of gravity alone in vacuum. Which quantities remain constant during the fall?
2. When will be the work done by a conservative force is positive?
3. When does the potential energy of a spring increases?
4. A vehicle of mass $5000\mathrm{kg}$ climbs up a hill of $10\mathrm{m}$. The potential energy