Posted by **Tammy** on Monday, October 15, 2007 at 9:33pm.

what distance should you keep between you and the car in front of you if the traffic is moving at 65mph? Your reaction time is 1s, and both the cars can decelerate at the same rate. Include reasonable estimate for the length of the car (you don't want your bumper to end up at the same location as the bumper or even the rear of the car in front of you).

65mph=29.05m/s

t=1s

a=constant

d=?

I am having trouble solving this problem. Would I use:

delta d = v_f^2 - v_0^2/(2a) But i don't think this is correct because there's no t and I also don't have a definite number for a. OR is the correct equation: d=d_0+v_0t+1/2at^2

but again I don't know a. Thanks in advance for your help. I really appreciate it.

- physics -
**bobpursley**, Monday, October 15, 2007 at 10:11pm
Why don't you find the final position when both have stopped, assuming the front car was d ahead at time zero? If the front car ends up behind the back car, a collision occured. You will need to adjust d to not let that happen.

## Answer This Question

## Related Questions

- Physics - what distance should you keep between you and the car in front of you ...
- physics - what distance should you keep between you and the car in front of you ...
- Physics - You are driving at the speed of 33.4 m/s (74.7296 mph) when suddenly ...
- Physics - You are sitting in your car at a traffic light at the foot of a 200 ft...
- Physics - The stoplights on a street are designed to keep traffic moving at 34 ...
- University Physics - Consider this traffic problem that is played out in many ...
- Physics - You are driving at the speed of 33.4 m/s (74.7296 mph) when suddenly ...
- physics - Traffic shock wave. An abrupt slowdown in concentrated traffic can ...
- kinetics - a stationary car is hit from behind by another car travelling at 40km...
- kinetics - a stationary car is hit from behind by another car travelling at 40km...

More Related Questions