# I need some help with some basic material

1. Oct 1, 2004

I can't seem to figure these problems if anyone can give me the concept and start me off that would be great.

Problem one: A car is traveling at a constant speed of 27 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain so that the two cars meet for the first time at the next exit which is 1.8 km away?

Problem two: A bus stop to pick up riders. A woman is running at a constant velocity of +5.0 m/s in an attempt to catch the bus When she is 11 m from the bus, it pulls away with a constant acceleration of +1.0 m/s^2. From this point, how much time does it take her to reach the bus if she keeps running with the same velocity?

*edit*
Oh sorry i posted this after i read the before you post thread Once again Im sorry for posting Homework help here

Last edited: Oct 1, 2004
2. Oct 1, 2004

### Pyrrhus

For the first problem consider the formulas

$$vt = x$$

$$\frac{1}{2}at^2 = x$$

You go the speed for the car and the distance x they will both travel, what can you do with that?

For the second problem

She will do

$$vt = x + 11$$

while the bus will do

$$\frac{1}{2}at^2 = x$$