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e = v t, en general.
Luego e = v . 8 s
Para la segunda situación:
e = (v + 8 m/s) . 7 s; igualamos:
v . 8 s = (v + 8 m/s) . t s = v . 7 s + 56 m
v . (8 - t) s = v . 1 s = 56 m
Finalmente v = 56 m/s
Saludos Herminio