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masa 800kg
velocidad inicial 0km
v.final 90km
tiempo 12 s
formula vf= vi+ at
despejo para encontrar a
queda
(vf-vi)/t= a
sustituyo
pero convierto los 90km/h a m/s
son 25 m/s
entonces
(25m/s)/ 12s = a
2.08333 = a
paso 2
F = ma
F = 800kg. 2.0833
F= 1666.66 N