Question

a car moving along A straight highway with speed of 72 km per hour is brought to a stop within a distance of 100m what is the retardation of the car and how long does it take for the car to stop

Answer 1

U =72 km /h

= 20 m/s

v=0

s =100m

v^2-u^2= 2as

-u^2= 2×a×100(v=0)

- 20^2=200a

-400=200a

a=-2 m/s^2

Answer 2

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u = 72 km/h

v=0

s =100m

v^2-u^2= 2as

-u^2= 2×a×100(v=0)

- 20^2=200a

-400=200a

a=-2 m/s^2

I hope, this will help you

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