I'm not really good at physics so relevant any feedback would be helpful. Here's the question;(adsbygoogle = window.adsbygoogle || []).push({});

At the instant a traffic light turns green, a car starts with a constant velocity of 6.0 ft/s. At the same instant a truck, traveling with a constant speed of 34 ft/s, overtakes and passes the car. How far beyond the traffic light will the car overtake the truck?

This is what I got so far;

The acceleration of both the truck and the car is zero.

truck: x=34(ft/s)t

Car: x=(1/2)(6.0ft/s+34ft/s)t=20t

This is where I get stuck. Can you tell me what I'm doing wrong or what I'm not doing?

I know that I will have to use two equations with two unknowns. By doing this I should get me the time it takes for the car to catch up to truck. Then I can plug the time back in to get the distance.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Velocity help

**Physics Forums | Science Articles, Homework Help, Discussion**