Question

ayuda es u. examen ayuda​

Answer 1

Respuesta:

Respuesta opción: C

Explicación:

Datos:

vo= 30 km/h =  8.33 m/s

vf = 50 km/h = 13.88 m/s

t = 10 seg

a =?

     13.88 m/s - 8.33 m/s

a = ---------------------------------- = 0.555 m/s²

                  10 seg

d₁ = vot + 0.5 at₂

d₁ = (8.33 x 10) + (0.5)(0.555)(10 seg)²

d₁ = 83.3 + 27.75

d₁ = 111.05 m

d₂ = v x t

d₂ =  13.88 m/s x 30 seg

d₂ = 416.4 m

d₃ =?

vo =  13.88 m/s

vf = 0

t ?= 20 seg

      0 - 13.88 m/s

a = --------------------- = - 0.694 m/s²

           20 seg

d = vot - 0.5at²

d₃ = (13.88 x 20) - (0.5)(0.694 m/s²)(20)²

d₃ = 277.6 - 138.8

d₃ = 138.8 m

dt = 111.05 m + 416.4 m + 138.8 m

dt = 666.25 m

Respuesta opción: C