Question

When a car driver travelling at a speed of 10m/s applies brakes and brings the car to rest in 20s, then retardation will be *​

Answer 1

A car driver is traveling at a speed of 10m/s .

e.g., initial velocity , u = 10m/s

He applied break and brings to the car to rest in 20s.

so, time taken to stop the car = 20s

we have to find retardation.

final velocity of car , v = 0

use formula, v = u + at

0 = 10 + a20

a = -1/2 m/s² [hereative sign shows retardation ]

Answer 2

Explanation:

time =10 second

initial velocity =10 metre per second

final velocity zero( rest )

acceleration =final velocity- initial velocity /time

retardation. =0-10/20

= -10/20

= -1/2

therefore the acceleration is -1/2 on youth edition is 1/2.