# Question #872c3

##### 1 Answer

Sep 21, 2017

#### Answer:

F= 100.000 N

#### Explanation:

using the two movement equations you have:

where v= 0 m/s (the car is stopped) V°= 20m/s . and acceleration has the opposite verse of velocity

From the second equation you have

i.e

then

from the second dinamic equation: F= ma we have