Posted by **HELP PLEASE!!** on Sunday, September 28, 2008 at 10:22pm.

As a traffic light turns green, a waiting car starts with a constant acceleration of 6.0 m/s^2. At the instant the car begins to accelerate, a truck with a constant velocity of 21 m/s passes in the next lane.

A)How far will the car travel before it overtakes the truck?

B)How fast will the car be travelling when it overtakes the truck?

- physics -
**drwls**, Monday, September 29, 2008 at 12:03am
Write equations for the distance from the traffic light vs time for each car. Measure time from when they leave the light.

X1 = 3 t^2

X2 = 21 t

Set X1 = X2 and solve for t. Take the nonzero solution. Use that t and either equation to get the location. The velocity of the car at that time will be 6.0 * t. I expect it will be 42 m/s, since it will have to have the same average velocity as the truck at that time.

## Answer this Question

## Related Questions

- Physics - As a traffic light turns green, a waiting car starts with a constant ...
- Physics - The instant a traffic light turns green a car that has been waiting at...
- Physics - As a traffic light turns green, a waiting car starts with a constant ...
- Physics - At the instant a traffic light turns green, a car starts with a ...
- Physics - At the instant the traffic light turns green, a car that has been ...
- physics - At the instant a traffic light turns green, a car starts moving with a...
- physics - The car stationary in front of a red traffic light. As the light turns...
- physics - The car stationary in front of a red traffic light. As the light turns...
- Physics - At the instant a traffic light turns green, a car starts moving with a...
- physics - At the instant the traffic light turns green, an automobile starts ...