- #1

hiineko

- 63

- 1

## Homework Statement

In the figure here, a red car and a green car move toward each other in adjacent lanes and parallel to an

*x*axis. At time

*t*= 0, the red car is at

*xr*= 0 and the green car is at

*xg*= 223 m. If the red car has a constant velocity of 20.0 km/h, the cars pass each other at x = 43.1 m. On the other hand, if the red car has a constant velocity of 40.0 km/h, they pass each other at

*x*= 76.9 m. What are

**(a)**the initial velocity and

**(b)**the (constant) acceleration of the green car? Include the signs.

## Homework Equations

[/B]

## The Attempt at a Solution

eq 1 = 179.9=Vo(7.75)+1/2a(7.75)^2

eq 2 = 146.1=Vo(6.92)+1/2a(6.92)^2

insert 2 to 1

Vo = 146.1-1/2a(6.92)/(6.92)

179.9=(146.1-1/2a(6.92)/(6.92))(7.75)+1/2a(7.75)^2

got a = 5.06 m/s^2

and vo as 3.60

is my answer right?