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Respuestas a la pregunta
Respuesta:
Explicación:
1)
vo= 10 m/s
a = 2 m/s²
vf =?
t = 5 seg
e = a los 10 seg
vf = vo + at
vf = 10 m/s + ( 2m/s² x 5 seg)
vf = 10 m/s + 10 m/s
vf = 20 m/s
e = vot + 0.5at²
e = (10 m/s x 10 seg) + (0.5 x 2 m/s²)(10 seg)²
e = 100 m + 100 m
e= 200 m
2)
vo= 30 m/s
e = 80 m
vf = 10 m/s
t=?
a=?
Primero calculamos la aceleración, para luego calcular el tiempo.
vf² - vo² (10 m/s)² - ( 30 m/s)² 100 m²/s² - 900m²/s²
a = ------------- = ----------------------------- = --------------------------------
2e 2 x 80 m 160 m
-800 m²/s²
a = ------------------- = - 5 m/s²
160 m
vf - vo 10 m/s - 30 m/s - 20 m/s
t = ------------- = -------------------------- = -------------- = 4 seg
-a - 5 m/s² - 5 m/s²
3)
vo= 10 m/s
e = 20 m
vf = 16 m/s
a) aceleración.
vf² - vo² (16 m/s)² - (10 m/s)² 256 m²/s² - 10 m²/s²
a = ------------ = ---------------------------- = ---------------------------------
2e 2 x 20 m 40 m
246 m²/s²
a= ----------------- = 6.15 m/s²
40 m
vf - vo 16 m/s - 10 m/s 6 m/s
t = -------------- = --------------------------- = ----------------- = 0.97 seg
a 6.15 m/s² 6.15 m/s²
vf - vo 25 m/s - 16 m/s 9 m/s
t = ---------------- = -------------------------- = ------------------ = 1.43 seg
a 6.15 m/s² 6.15 m/s²
d)
vf² - vo² (10 m/s)² - 0 100 m²/s²
d = ------------------- = ------------------------ = ------------------- = 87.7 m
2 a 2 x 6.15 m/s² 12.3 m/s²