How long does it take a car to cross a 30 m wide intersection after the light turn green, if
the car accelerates from rest at a constant 3.00 m/s2

Respuesta :

Answer:

[tex]t=4.47s[/tex]

Explanation:

Hello,

In this case, since the car starts from from rest whereas the initial velocity is zero, we can compute the time via the following equation:

[tex]d=v_0*t+\frac{1}{2}at^2\\\\d=\frac{1}{2}at^2[/tex]

Which is solving by applying square root:

[tex]3.00t^2=2*30\\\\t=\sqrt{\frac{2*30m}{3.00m/s^2} }\\ \\t=4.47s[/tex]

Best regards.