A particle is projected from a smooth horizontal surface with velocity v at an angle 𝜃 from horizontal . Coefficient of restitution between the surface and ball is e . The distance of the point where ball strikes the surface second time from the point of projection is . (〖v^2 𝑣𝑠𝑖𝑛2𝜃〗⁡〖(1+〗 e^2))/𝑔 (〖v^2 𝑣𝑠𝑖𝑛2𝜃〗⁡〖(1+〗 e^4))/𝑔 (〖v^2 𝑣𝑠𝑖𝑛2𝜃〗⁡〖(1+〗 e^3))/𝑔 (〖v^2 𝑣𝑠𝑖𝑛2𝜃〗⁡〖(1+〗 𝑒))/𝑔