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A projectile has both change in kinetic and potential energy. Still the work done calculated between any two points is zero. This is due to _________

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A projectile has both change in kinetic and potential energy. Still the work done calculated between any two points is zero. This is due to _________

(a) Presence of no external force

(b) No displacement

(c) The displacement being in both vertical and horizontal directions

(d) Inter-conversion of kinetic and potential energies

I got this question in unit test.

The question is from Work-Energy Theorem topic in division Work, Energy and Power of Physics – Class 11

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The correct choice is (d) Inter-conversion of kinetic and potential energies

Easiest explanation: When a projectile moves, there is an inter-conversion of kinetic and potential energies. This is what causes the body to cover a maximum vertical and horizontal distance. One might argue over the presence of gravity which is an external force. Well, the work done by gravity is nothing but the potential energy of the body which has already been taken care of in the expression for total energy.

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