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Respuesta:
rapidez inicial = vo
rapidez final = vf
usemos formula
d=((vf+vo)/2) x t
20=((10)/2) x t
20=5 x t
4 segundos = t
formula
vf=vo+ a x t
vf - vo= 2 x 4
vf - vo=8
sabiendo que:
vf - vo=8
vf + vo=10
sumamos
vf - vo=8. +
vf + vo=10
---------------
2vf=18
vf=9
rapidez final = vf=9
rpta=9m/s