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Vo = ( 36 km/h ) * ( 1000 m / 1 km ) *
( 1 h / 3600 s ) = 10 m/s
Vf = ( 90 km/h ) * ( 1000 m / 1 km ) *
( 1 h / 3600 s ) = 25 m/s
Usaremos:
Vf = Vo + a * t
Despejando "a"
Vf - Vo = a * t
a = ( Vf - Vo ) / t
a = ( 25 m/s - 10 m/s ) / ( 4 s )
a = 3.75 m/s²
Espero haberte ayudado, saludos!