Sunday

March 29, 2015

March 29, 2015

Posted by **Dave** on Saturday, January 28, 2012 at 3:31pm.

- Physics -
**Damon**, Saturday, January 28, 2012 at 3:55pmWell, I suppose I am to assume that you stopped in 108 meters.

first you went 12.7*.47 = 5.97 m before your foot hit the brake.

So the brakes must stop you in (108 -6) = 102 meters

That is the answer you asked for.

-----------------------------------

The rest of the problem:

102 = 12.7 t - (1/2) a t^2

and

0 = 12.7 - a t

t = 12.7/a

so

102 = 12.7^2/a - (1/2) (12.7^2)/a

204 a = 12.7^2

a = .8 m/s^2 about a tenth of g

**Answer this Question**

**Related Questions**

Physics - You are driving to the grocery store at 18.2 m/s. You are 120.0 m from...

Physics - You are driving to the grocery store at 18.2 m/s. You are 120.0 m from...

Physics - You are driving to the grocery store at 18.2 m/s. You are 120.0 m from...

Physics - You are driving to the grocery store at 18.2 m/s. You are 120.0 m from...

Physics - You are driving to the grocery store at 18.2 m/s. You are 120.0 m from...

Physics - You are driving to the grocery store at 14.8 m/s. You are 140.0 m from...

physics - You are driving to the grocery store at 12.2 m/s. You are 193.0 m from...

ph - You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an ...

Physics - You are driving to the grocery store at 20 m/s . You are 110m from an ...

physics - You are driving to the grocery store at 20 m/s. You are 110 m from an ...