Question

A car moving with a constant speed of 72 km/h and saw a obstacle at a distance of 5sec . calculate the retardation of brake provided so that it can aviod the accident?​

Answer 1

Answer:

u=72km/hr=20m/s

v=0m/s

t=5s

a=?

first equation =v=u+at

0m/s=20m/s+(5s)a

-20m/s/5s=a

-4m/s^2