Posted by **mike** on Sunday, February 14, 2010 at 10:07pm.

Please show me how to solve this problem. A person wearing a shoulder harness can survive a car crash if the acceleration is less that -300 m/s2. How far must the front end collapse if it crashes while going 101 km/hr?

Thanks.

- 8th grade science -
**drwls**, Monday, February 15, 2010 at 7:30am
101 km/h = 28.06 m/s

To decelerate from velocity V in a distance X at a rate of a = 300 m/s^2,

V = sqrt(2 a X)

X = V^2/(2 a) = 1.3 meters

This assumes the crash is into an immovable object, so that all deceleration is achieved by collapsing the front end. A collision with another car or a soft barrier might have a different result. This is a good approximation for a head-on collision with a similar car.

- 8th grade science -
**nene**, Monday, February 22, 2010 at 7:19pm
i want to ask you a question

- 8th grade science -
**shellie**, Friday, March 5, 2010 at 2:45pm
how do i do this problem

The Math Behind the Law How much force is Mike applying to the 1000 kg car to make it accelerate at a rate of .05 m/s2?

## Answer This Question

## Related Questions

- Physics - Can anyone help with which formula I should use to solve this: During ...
- Physics - During a head on car crash, the car is designed to slow down as its ...
- science! - 1. A plane accelerated from a speed of 2.0 m/s at the rate of 3.0 m/...
- phisecs - A car traveling at 26.8 m/s hits a stone wall . The driver, who is ...
- PHYSICS - car traveling at 28.8 m/s hits a stone wall . The driver, who is ...
- phisecs - car traveling at 22 m/s hits a stone wall . The driver, who is ...
- Physics - A person who is properly constrained by an over-the-shoulder seat belt...
- physics - The human body can survive an acceleration trauma incident (sudden ...
- College Physics - A person who is properly constrained by an over-the shoulder ...
- physics - The human body can survive a negative acceleration trauma incident (...

More Related Questions