Question

A car moving with a velocity 20 m/s is came to rest by applying the brakes in 5sec. Calculate reterdation and the distance travel by the car?

Answer 1

Given:
v=0m/s
u=20m/s
t=5 sec
a=?
we know :a=$\frac{v-u}{t}$
a= $\frac{0-20}{5}$
  = $\frac{-20}{5}$
a = -4m/s²

Answer 2

 initial velocity<u> as 20 m/s

 final velocity<v> as 0 m/s as car breaks and time<t> is 5 sec 

 acceleration<a>= (v - u)/t  ,
 
a= (0 - 20)/5,

a= -4 m/s(sq) here ' - ' sign shows .

And displacement<s>

    ,
 
s= (0 - 400)/(2*< - 4>) ,
 
s=50 m <ans.>