# Homework Help: Accelaration/ traveling problem

1. Jan 26, 2010

### Teenytiny1991

1. The problem statement, all variables and given/known data
A camero runs a red light and hits an suv directly behind where a tv news crew is filming. from the sound of the dqueling tires recorded on film, the police can tell that the driver applied his breaks for exactly 1.69 secs. a csi team review the clip and determines the care decelerated at a constant rate of -10.2 m/s^2 prior to the impact. the skid marks determined he breaked for 48.2 meters
A) how fast was the camero going before the driver applied the breaks
B) how fast was the camero traveling when it hit the suv

2. Relevant equations

3. The attempt at a solution
-10.2 m/s^2 x 1.69 sec/ 48.2 m i dont think i set it up crrectly =(

2. Jan 26, 2010

### tiny-tim

Hi Teenytiny1991!

(try using the X2 tag just above the Reply box )

You have a s and t, and you want u and v.

Which of the standard constant acceleration equations should you use?

What do you get?

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