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Exercício de Lançamento horizontal
Exercício:
5-Uma bola rolou para fora de uma mesa de 80 cm de
altura e avançou horizontalmente, desde o instante em
que abandonou a mesa até o instante em que atingiu o
chão, 80 cm. Considerando g = 10 m/s², a velocidade da
bola, ao abandonar a mesa, era de:
a) 8,0 m/s
b) 5,0 m/s
c) 4,0 m/s
d) 2,0 m/s
e) 1,0 m/s
Informações Adicionais:
g= 10m/s²
d = vx.t
80 = vx.t
descobre o t
t²=h/5
t²=80/5
t=4s
substitui
80/4= vx
vx = 20
transforma as unidades
vx= 2 m/s
h=g.t²/2
0,8=10.t²/2
1,6=10t²
t²=1,6/10
0,16=0,4s
a=vox.t
0,8=vox.0,4
vox=2m/s
0,8=5t
t=0,16
V=0,8/0,16
V=5 m/s
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