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Primero sacamos los datos.
vi = 4,5 km/h
vf = 40 km/h
t = 8 s
m = 1500 kg
a = ?
F = ?
Pasas las unidades al SI
vi = (4,5 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 1,25 m/s
vf = (40 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 11,11 m/s
Calculamos la aceleración
a = (vf - vi)/t
a = (11,11 m/s - 1,25 m/s)/8s
a = (9,86 m/s)/8s
a = 1,23 m/s²
Calculamos la fuerza.
F = ma
F = (1500 kg) (1,23 m/s²)
F = 1845 N
Respuesta.
F = 1845 N