Answer to Question #263160 in Mechanics | Relativity for Riwaydo Odorosh

Question

The area of no return at one intersection was calculated to be 59.0 m. What is the minimum length of time the traffic light should be yellow so a vehicle just entering the area of no return can clear the area while maintaining a speed of 70.0 km/h?

11.9 s

9.10 s

6.07 s

3.03 s

Answer 1

$v = 70\frac{km}{h}$

$s = 59.0m$

$v =70* \frac{1000}{3600}\approx 19.44\frac{m}{s}$

$s =v*t$

$t = \frac{s}{v}= \frac{59}{19.44}\approx 3.03s$

$\text{Answer: }3.03\ s$