Question

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

Answer 1

Answer:

Retardation = -0.5

Explanation:

let u be initial speed, v be final speed, t be time, a be retardation

u = 10m/s

v = 0m/s

t = 20s

By using formula,

v = u + at

0 = 10 + a×20

10 = 20a

a = 10/20

a = 0.5m/s

As retardation is negative,

retardation = -0.5