a = - 20 m/s²
x = 100 m
vf = 0 m/s
a) Aplicando:
vf² - v0² = 2.a.x0 - v0² = 2.a.xv0² = - 2.(-20 m/s²).(100 m)
vf = 63,25 m/s
b) Aplicando:
vf = v0 + a.t0 = v0 + a.t⇒ t = -v0/a
t = -(63,25 m/s)/(- 20 m/s²)t = 3,16 s
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a = - 20 m/s²
x = 100 m
vf = 0 m/s
a) Aplicando:
vf² - v0² = 2.a.x
0 - v0² = 2.a.x
v0² = - 2.(-20 m/s²).(100 m)
vf = 63,25 m/s
b) Aplicando:
vf = v0 + a.t
0 = v0 + a.t⇒ t = -v0/a
t = -(63,25 m/s)/(- 20 m/s²)
t = 3,16 s