Question

Alok drives his car at a speed of 20m/s. Seeing a hump ,he applies brakes and brings the car to rest in 40 s . The retardation thus produced

+ 2 m/s²

− 2 m/s²

− 0.5 m/s²

+ 0.5 m/s²

​

Answer 1

Answer:

Retardation = - 0.5m/s^2

Explanation:

Vi=20m/s

Vf=0m/s

t=40s

So,

acceleration = Vf-Vi/t

=0-20/40

= - 20/40

= - 0.5m/s^2