+0  
 
0
62
3
avatar

A Ford Falcon has a maximum breaking deceleration of 1.8m/s/s. If it is travelling at 120km/h before the brakes are applied, how long does it take to stop?

 Mar 19, 2020
 #1
avatar+111360 
+1

Note  that 

 

120km            1000m           hr

______ x       _______  x  _______  =    100/3  m/s

   hr                  1km            3600 s

 

 

We  have  that

 

Final velocity=  Initial Velocity +  acceleration * time

 

So

 

0  =  (100/3)m/s  +  -1.8  m / s^2  *  time

 

- (100/3)m/s  =  -1.8m/s^2  * time

 

(100/3)m/s  

__________  =   time

1.8 m/s^2

 

(100/3) s                     100

_______  =  time  =   _____ s    ≈  18.52 s

    1.8                           5.4

 

 

cool cool cool

 Mar 19, 2020
 #2
avatar
0

Thank you, very helpful :)

Guest Mar 19, 2020
 #3
avatar+111360 
0

OK....glad to help   (even though I forgot most of the Physics I once learned.....LOL!!! )

 

 

cool cool cool

CPhill  Mar 19, 2020

14 Online Users

avatar