Question

72 kilometre per hour is slow down to e 18kilometre per hour by the application of brakes over distance of 20 metre. total time in which car stops in seconds​

Answer 1

Answer:6.2 seconds

Explanation:

U=72kmph=72×5÷18=20mps

V=18kmph=18×5÷18=5mps

S=20m

A=?

By

V^2-u^2=2as

A=-9.4 mps^2

By v=u+at

5=20+(-9.4)×t

T=6.2 sec