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Dayane245
@Dayane245
December 2019
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Uma particula executa um muv em trajetoria retilinea obedecendo a funçao horaria = 4 - 12.t + 2t².O movimento muda de sentido no instante t, em segundo igual.
a) 1
b) 2
c)3
d)4
e)5
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nancitieco
S = So + vot + at²/ 2
S = 4 - 12t + 2t²
Vo = - 12 m/s
a/2 = 2 ===> a = 4 m/s²
V = vo + a t
V = -12 + 4 t ; o móvel muda de sentido quando V = 0
0 = -12 + 4t
4t - 12 = 0
4t = 12
t = 12 / 4
t = 3 s portanto a partícula muda de sentido no instante t= 3s
alternativa : C
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S = 4 - 12t + 2t²
Vo = - 12 m/s
a/2 = 2 ===> a = 4 m/s²
V = vo + a t
V = -12 + 4 t ; o móvel muda de sentido quando V = 0
0 = -12 + 4t
4t - 12 = 0
4t = 12
t = 12 / 4
t = 3 s portanto a partícula muda de sentido no instante t= 3s
alternativa : C