A particle is projected from a smooth horizontal surface with velocity v at an angle ๐œƒ 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 ๐‘ฃ๐‘ ๐‘–๐‘›2๐œƒ〗⁡〖(1+〗 e^2))/๐‘” (〖v^2 ๐‘ฃ๐‘ ๐‘–๐‘›2๐œƒ〗⁡〖(1+〗 e^4))/๐‘” (〖v^2 ๐‘ฃ๐‘ ๐‘–๐‘›2๐œƒ〗⁡〖(1+〗 e^3))/๐‘” (〖v^2 ๐‘ฃ๐‘ ๐‘–๐‘›2๐œƒ〗⁡〖(1+〗 ๐‘’))/๐‘”

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