Question

A car decreases its speed from 80km/h to 20km/h in 6sec .what will be it's retardation​

Answer 1

Answer:

Explanation:

retardation = -acceleration

                   = -(final velocity - initial velocity)/time

                  = -(5.5 - 22.2)/6 [km/hr converted to m/s]

                 =-(-16.7)/6

                  = -(-2.78)

                 = 2.78 m/s^2

             

                   

                 

Answer 2

a=v2-v1÷t

we have to take velocity in m/s

a=16.66-22.22÷6=-0.92

retardation= -a

= -(-0.92)=0.92m/s2