Question

When a car driver travelling at a speed of 10 $\frac{m}{s}$ applies brakes and brings the car to rest in 20s, then retardation will be :

(a) $+2m/s^2$ (b) $-2m/s^2$ (c) $-0.5m/s^2$ (d) $+0.5m/s^2$

Answer 1

Applying

a =

a=

Acceleration is -0.5 .Since we know that negative acceleration is retardation,

Hence retardation will be 0.5