A jumper does a standing long jump with and without arm swing. How much does arm swing effect flight phase horizontal displacement? Jump without arm swing dx flight $=1\mathrm{.}35$ m$.$ With arm swing his vertical take off velocity increases $35\%$ from $0\mathrm{.}8$m$/$s to $1\mathrm{.}08$ m$/$s and his horizontal take off velocity increased $10\%$ from $4\mathrm{.}5$ m$/$s to $4\mathrm{.}95$ m$/$s$.$ His Center of mass height at landing is $\mathrm{.}2$m lower than his com height at take off.