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:
A) + 2m\s2
B) - 2 m\s2
C) - 0.5 m\s2
D) + 0.5 m\s2​

Answer 1

Answer: (D) + 0.5 m/s2

Step-By-Step Explanation:

U (initial velocity) = 10 m/s  

V (final velocity) = 0 m/s  

t (time taken) = 20s  

a (acceleration) = (V – U) / t  

a = 0 – 10 / 20  

a = – 0.5 m/s2  

Retardation = 0.5 m/s2