Question

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Answer 1

Explicacion
18.
Vo = 30 m/s
Vf = 20 m/s
t = 40 s
Formula
a = Vf  -  Vo / t = 20 m/s  -  30 m/s / 40 s = - 0.25 m / s²
d = Vf²  -  Vo² / 2 a  = (20 m/s)²  -  (30 m/s)² / 2 (- 0.25 m/s)m = 2000 m
23.
t = 30 s
Vf = 25 m/s²
Vo = ?
d = ?
Formula
a = Vf / t  = 25 m/s / 30 s = 0.833 m/s²
d = Vf² / 2 a  = (25 m/s)² / 2 (0.833 m/s²) = 375.15 m
27.
d = 3000 m
Vf = 300 km/h = 83.33 m/s
Vo = 0
a = ?
Formula
d = Vf²  -  Vo²  / 2 a
a = Vf² / 2 d = (83.33 m/s)² / 2 (3000 m) = 1.15 m/s²
31.
Vo = 9 m/s
a = 0.5 m/s²
t = 4 s
Vf = ?
Formula
a = Vf  -  Vo / t
a t = Vf  -  Vo
Vf = Vo  +  a t = 9 m/s   +   (0.5 m/s²) (4 s) = 11 m/s
40.
t = 1.8 s
g = 10 m/s²
h = ?
Formula
h = g t² / 2  =  (10 m/s²) (1.8 s)² / 2 = 16.2 m
44.
Vo = 0
h = 2.2 m
g = 10 m/s²
m = 0.75 kg
Vf = ?
Formula
t = √ 2 h / g  = √ 2 (2.2 m) / 10 m/s² = 0.663 s
Vf = g t = (10 m/s²)(0.663 s) = 6.63 m/s

te deje un ejercicio de tarea, espero haberte apoyado.a saludos.