Question

when a car driver traveling at a speed of 10m/s applies brakes and brings the car to rest in 20 seconds their the retardatin will be a. +2 m/s square b. -2 m/s square c.-0.5m/s square d. +0.5 m/s square​

Answer 1

Answer:

Explanation:

given,

initial velocity-10m/s

final velocity-0m/s

time-20s

sol---

since, the car driver decreases the velocity

hence,we. need to find the retardation of the car

therefore,

acceleration=final velocity-initial  

                          velocity/time taken

                   a=0-10/20

                    a=-10/20

                    a=-1/2

                      a=-0.5m/s×s

          hence,the retardation is -0.5m/s×s

Answer 2

Answer:

D

Explanation:

a=0-10/20

=1/2

=0.5 m/s