MCQ
Which one of the following possesses both kinetic and potential energies?
- AA man walking on the road.
- ✓A man climbing a hill.
- CA man lying on his bed.
- DA man running in the garden.
✓
Answer
Correct option: B.
A man climbing a hill.
Kinetic energy is due to motion of the object and potential energy is due to relative position of object wrt earth.
In option $A.$ Relative position is same so no potential energy if we assume reference as level of road( assuming horizontal road), but have kinetic energy as the man is in motion.
In option $C$ he is lying on bed so neither relative change in position nor body in motion so have none of the energies kinetic or potential.
In option $D$ this is same case as that of option $A. ($assuming level park$).$
But in option $B,$ man is climbing a hill so relative position wrt ground level changes so it gain some potential energy and also he is moving so also have kinetic energy.
In option $A.$ Relative position is same so no potential energy if we assume reference as level of road( assuming horizontal road), but have kinetic energy as the man is in motion.
In option $C$ he is lying on bed so neither relative change in position nor body in motion so have none of the energies kinetic or potential.
In option $D$ this is same case as that of option $A. ($assuming level park$).$
But in option $B,$ man is climbing a hill so relative position wrt ground level changes so it gain some potential energy and also he is moving so also have kinetic energy.
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