Respuesta:
primero pasamos de km/h a m/s
70 km/h * 1000 m * 1 h / 3600 seg * 1 km = 19,44 m/s
aceleracion
a = vf - vo / t
a = 0 - 19,44 m/s / 15 seg
a = -1,296 m/s2
distancia total recorrida
dmax = vo2 / 2a
dmax = (19,44m/s)^2 / 2·(-1,296m/s2)
dmax = 377,91 m2/s2 / -2,592 m/s2
dmax = 145,79 m
v a los 6 seg de haber frenado
vf = vo - a.t
vf = 19,44 m/s - 1,296 m/s2 * 6 seg
vf = 19,44 m/s - 7,776 m/s
vf = 11,664 m/s
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Respuesta:
primero pasamos de km/h a m/s
70 km/h * 1000 m * 1 h / 3600 seg * 1 km = 19,44 m/s
aceleracion
a = vf - vo / t
a = 0 - 19,44 m/s / 15 seg
a = -1,296 m/s2
distancia total recorrida
dmax = vo2 / 2a
dmax = (19,44m/s)^2 / 2·(-1,296m/s2)
dmax = 377,91 m2/s2 / -2,592 m/s2
dmax = 145,79 m
v a los 6 seg de haber frenado
vf = vo - a.t
vf = 19,44 m/s - 1,296 m/s2 * 6 seg
vf = 19,44 m/s - 7,776 m/s
vf = 11,664 m/s