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La velocidad debe expresarse en m/s; V = 73,8 km/h = 20,5 m/s
a) ω = V/R = 20,5 m/s / 250 m = 0,082 rad/s
b) an = V²/R = (20,5 m/s)² / 250 m = 1,68 m/s²
Si el radio es de 250 cm, debes reemplazar 250 con 2,50
Saludos Herminio