Question

When a car driver travelling at a speed of 20 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:​

Answer 1

Answer:

SEE THE ANSWER!!!

Explanation:

in the given question  

u=20m/s

v=0m/s

t=10s

and a=?

we know the formula v =u + at

so putting the values we get  

0 = 20 + a X 10

- 20 = 10 a

-2 = a  

we get acceleration is -2 so retardation will be +2 m/ sec sq.

Answer 2

Answer:

1m/s^2

Explanation:

v=0

u=20m/s

t=20s

v=u+at

0=20+20a

20a=-20

a=-20/20=-1m/s^2

retardation=-(-1)=1m/s^2

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